[observer] Fix index reporting bug
[observer] Fix index reporting bug

Fix crash when more than one index was set on mnesia table,
reported by Eric Pailleau.

erlang/otp,lhslll/otp,lantti/otp,lucafavatella/otp,ader1990/otp,platinumthinker/otp,psyeugenic/otp,derek121/otp,basho/otp,lightcyphers/otp,cnbin/otp,RaimoNiskanen/otp,bernardd/otp,benoitc/otp-1,sdebnath/otp,psyeugenic/otp,vinoski/otp,isvilen/otp,bernardd/otp,lrascao/otp,schlagert/otp,cobusc/otp,lhslll/otp,electricimp/otp,lemenkov/otp,fenollp/otp,jinshana/otp,gjaldon/otp,vic/otp,emile/otp,vinoski/otp,goertzenator/otp,release-project/otp,jamesruan/otp,marquisthunder/otp,jemsbhai/otp,theom/otp,krishnakumar4a4/otp,falkevik/otp,neeraj9/otp,isvilen/otp,lianghaivv/otp,c-rack/otp,lrascao/otp,lucafavatella/otp,palas/otp,hairyhum/otp,sdebnath/otp,Teino1978-Corp/otp,cobusc/otp,emacsmirror/erlang,beni55/otp,bsmr-erlang/otp,lemenkov/otp,fenollp/otp,haguenau/otp,tuncer/otp,paladim/otp,cobusc/otp,sdebnath/otp,marquisthunder/otp,dumbbell/otp,mikpe/otp,sammoth-wazoku/otp,dumbbell/otp,klarna/otp,uabboli/otp,mikpe/otp,fenollp/otp,release-project/otp,legoscia/otp,yangchengjian/otp,entropiae/otp,vic/otp,krishnakumar4a4/otp,awetzel/otp,jj1bdx/otp,saleyn/otp,ferd/otp,neeraj9/otp,uabboli/otp,dgud/otp,matwey/otp,sammoth-wazoku/otp,klarna/otp,lrascao/otp,jj1bdx/otp,legoscia/otp,lantti/otp,hairyhum/otp,dumbbell/otp,g-andrade/otp,paulcager/otp,c-rack/otp,ferd/otp,sitexa/otp,lrascao/otp,beni55/otp,vladdu/otp,bernardd/otp,lightcyphers/otp,platinumthinker/otp,entropiae/otp,emile/otp,legoscia/otp,RichMorin/otp,RichMorin/otp,krishnakumar4a4/otp,weisslj/otp,jemsbhai/otp,dumbbell/otp,Teino1978-Corp/otp,krishnakumar4a4/otp,bernardd/otp,erlang/otp,rlipscombe/otp,g-andrade/otp,fenollp/otp,release-project/otp,emacsmirror/erlang,ferd/otp,RaimoNiskanen/otp,getong/otp,matwey/otp,sdebnath/otp,NOMORECOFFEE/otp,emile/otp,gjaldon/otp,weisslj/otp,GinjaNinja32/otp,lucafavatella/otp,riverrun/otp,VincentHHL/otp,dumbbell/otp,lrascao/otp,RaimoNiskanen/otp,haguenau/otp,matwey/otp,klarna/otp,paulcager/otp,Teino1978-Corp/erlang-otp,RoadRunnr/otp,legoscia/otp,sammoth-wazoku/otp,beni55/otp,lucafavatella/otp,ader1990/otp,RJ/otp,yangchengjian/otp,sdebnath/otp,klarna/otp,weisslj/otp,jj1bdx/otp,lucafavatella/otp,gjaldon/otp,mikpe/otp,goertzenator/otp,lucafavatella/otp,derek121/otp,matwey/otp,electricimp/otp,paladim/otp,schlagert/otp,RoadRunnr/otp,bsmr-erlang/otp,hairyhum/otp,stolen/otp,bugs-erlang-org/otp,theom/otp,legoscia/otp,potatosalad/otp,vinoski/otp,schlagert/otp,getong/otp,yangchengjian/otp,rlipscombe/otp,vladdu/otp,derek121/otp,jj1bdx/otp,erlang/otp,ader1990/otp,aboroska/otp,g-andrade/otp,entropiae/otp,RaimoNiskanen/otp,jamesruan/otp,kvakvs/otp,vinoski/otp,dumbbell/otp,stolen/otp,saleyn/otp,ahmedshafeeq/otp,enikki/otp,hairyhum/otp,mikpe/otp,fenollp/otp,beni55/otp,derek121/otp,lrascao/otp,emacsmirror/erlang,awetzel/otp,riverrun/otp,lightcyphers/otp,stolen/otp,getong/otp,kvakvs/otp,jamesruan/otp,psyeugenic/otp,ferd/otp,benoitc/otp-1,bernardd/otp,haguenau/otp,RichMorin/otp,sitexa/otp,RichMorin/otp,cobusc/otp,jemsbhai/otp,entropiae/otp,enikki/otp,getong/otp,bugs-erlang-org/otp,sammoth-wazoku/otp,hairyhum/otp,saleyn/otp,platinumthinker/otp,NOMORECOFFEE/otp,uabboli/otp,cobusc/otp,lemenkov/otp,msantos/otp,RGafiyatullin/otp,stolen/otp,bjorng/otp,RJ/otp,mikpe/otp,release-project/otp,bsmr-erlang/otp,lantti/otp,GinjaNinja32/otp,paladim/otp,dgud/otp,platinumthinker/otp,RJ/otp,psyeugenic/otp,sdebnath/otp,electricimp/otp,bsmr-erlang/otp,basho/otp,johanclaesson/otp,theom/otp,palas/otp,mujiatong/otp,krishnakumar4a4/otp,emacsmirror/erlang,enikki/otp,isvilen/otp,NOMORECOFFEE/otp,awetzel/otp,RoadRunnr/otp,ahmedshafeeq/otp,johanclaesson/otp,platinumthinker/otp,ader1990/otp,RGafiyatullin/otp,uabboli/otp,yangchengjian/otp,jamesruan/otp,platinumthinker/otp,potatosalad/otp,krishnakumar4a4/otp,goertzenator/otp,erlang/otp,sitexa/otp,dgud/otp,VincentHHL/otp,dgud/otp,RaimoNiskanen/otp,GinjaNinja32/otp,yangchengjian/otp,VincentHHL/otp,stolen/otp,entropiae/otp,matwey/otp,fenollp/otp,haguenau/otp,hairyhum/otp,johanclaesson/otp,aboroska/otp,jinshana/otp,vladdu/otp,tuncer/otp,RaimoNiskanen/otp,lightcyphers/otp,entropiae/otp,uabboli/otp,bjorng/otp,psyeugenic/otp,palas/otp,emile/otp,mujiatong/otp,vinoski/otp,benoitc/otp-1,sitexa/otp,Teino1978-Corp/erlang-otp,marquisthunder/otp,saleyn/otp,johanclaesson/otp,kvakvs/otp,aboroska/otp,emile/otp,stolen/otp,tuncer/otp,msantos/otp,RJ/otp,weisslj/otp,emacsmirror/erlang,riverrun/otp,lhslll/otp,Teino1978-Corp/otp,jinshana/otp,vladdu/otp,uabboli/otp,rlipscombe/otp,dumbbell/otp,msantos/otp,falkevik/otp,theom/otp,electricimp/otp,aboroska/otp,bugs-erlang-org/otp,emile/otp,sitexa/otp,psyeugenic/otp,msantos/otp,potatosalad/otp,cobusc/otp,basho/otp,tuncer/otp,klarna/otp,kvakvs/otp,mikpe/otp,ahmedshafeeq/otp,gjaldon/otp,yangchengjian/otp,lantti/otp,basho/otp,bjorng/otp,RGafiyatullin/otp,lianghaivv/otp,getong/otp,tuncer/otp,aboroska/otp,massemanet/otp,sammoth-wazoku/otp,jamesruan/otp,lightcyphers/otp,tuncer/otp,g-andrade/otp,derek121/otp,RJ/otp,ferd/otp,matwey/otp,rlipscombe/otp,riverrun/otp,tuncer/otp,ahmedshafeeq/otp,isvilen/otp,RJ/otp,lemenkov/otp,emacsmirror/erlang,klarna/otp,erlang/otp,falkevik/otp,theom/otp,GinjaNinja32/otp,marquisthunder/otp,weisslj/otp,tuncer/otp,erlang/otp,paladim/otp,palas/otp,potatosalad/otp,vinoski/otp,emile/otp,lucafavatella/otp,msantos/otp,release-project/otp,beni55/otp,c-rack/otp,johanclaesson/otp,vic/otp,lianghaivv/otp,g-andrade/otp,Teino1978-Corp/otp,emacsmirror/erlang,dgud/otp,goertzenator/otp,jinshana/otp,RaimoNiskanen/otp,schlagert/otp,haguenau/otp,potatosalad/otp,massemanet/otp,awetzel/otp,isvilen/otp,schlagert/otp,jj1bdx/otp,bugs-erlang-org/otp,johanclaesson/otp,marquisthunder/otp,RGafiyatullin/otp,RaimoNiskanen/otp,bjorng/otp,GinjaNinja32/otp,mikpe/otp,lantti/otp,kvakvs/otp,falkevik/otp,krishnakumar4a4/otp,mujiatong/otp,lianghaivv/otp,vladdu/otp,johanclaesson/otp,paladim/otp,bsmr-erlang/otp,cobusc/otp,hairyhum/otp,enikki/otp,emacsmirror/erlang,ader1990/otp,lightcyphers/otp,neeraj9/otp,release-project/otp,haguenau/otp,kvakvs/otp,paulcager/otp,ader1990/otp,rlipscombe/otp,marquisthunder/otp,RGafiyatullin/otp,vladdu/otp,jj1bdx/otp,jinshana/otp,lantti/otp,g-andrade/otp,stolen/otp,RoadRunnr/otp,platinumthinker/otp,yangchengjian/otp,ahmedshafeeq/otp,jemsbhai/otp,rlipscombe/otp,mikpe/otp,getong/otp,neeraj9/otp,weisslj/otp,dgud/otp,haguenau/otp,gjaldon/otp,stolen/otp,bernardd/otp,jinshana/otp,c-rack/otp,potatosalad/otp,gjaldon/otp,Teino1978-Corp/erlang-otp,c-rack/otp,Teino1978-Corp/erlang-otp,aboroska/otp,weisslj/otp,marquisthunder/otp,RichMorin/otp,NOMORECOFFEE/otp,vladdu/otp,potatosalad/otp,c-rack/otp,lucafavatella/otp,RichMorin/otp,NOMORECOFFEE/otp,derek121/otp,enikki/otp,lianghaivv/otp,palas/otp,RJ/otp,vladdu/otp,entropiae/otp,vic/otp,saleyn/otp,sdebnath/otp,jj1bdx/otp,RGafiyatullin/otp,massemanet/otp,legoscia/otp,lianghaivv/otp,goertzenator/otp,bjorng/otp,massemanet/otp,msantos/otp,bernardd/otp,lhslll/otp,electricimp/otp,paulcager/otp,legoscia/otp,schlagert/otp,RichMorin/otp,basho/otp,falkevik/otp,rlipscombe/otp,bjorng/otp,psyeugenic/otp,awetzel/otp,paladim/otp,ahmedshafeeq/otp,goertzenator/otp,vinoski/otp,g-andrade/otp,GinjaNinja32/otp,massemanet/otp,cnbin/otp,yangchengjian/otp,RaimoNiskanen/otp,Teino1978-Corp/otp,Teino1978-Corp/otp,bernardd/otp,VincentHHL/otp,Teino1978-Corp/erlang-otp,lhslll/otp,falkevik/otp,isvilen/otp,benoitc/otp-1,msantos/otp,RichMorin/otp,hairyhum/otp,lhslll/otp,beni55/otp,RoadRunnr/otp,massemanet/otp,sammoth-wazoku/otp,lrascao/otp,falkevik/otp,sitexa/otp,getong/otp,g-andrade/otp,ferd/otp,lianghaivv/otp,mikpe/otp,krishnakumar4a4/otp,release-project/otp,electricimp/otp,dumbbell/otp,RGafiyatullin/otp,sammoth-wazoku/otp,marquisthunder/otp,bsmr-erlang/otp,haguenau/otp,beni55/otp,lightcyphers/otp,kvakvs/otp,platinumthinker/otp,awetzel/otp,theom/otp,lantti/otp,dgud/otp,jj1bdx/otp,erlang/otp,neeraj9/otp,aboroska/otp,potatosalad/otp,matwey/otp,saleyn/otp,erlang/otp,getong/otp,ahmedshafeeq/otp,lemenkov/otp,cobusc/otp,dumbbell/otp,kvakvs/otp,getong/otp,goertzenator/otp,GinjaNinja32/otp,tuncer/otp,g-andrade/otp,bjorng/otp,palas/otp,erlang/otp,Teino1978-Corp/otp,vinoski/otp,ahmedshafeeq/otp,isvilen/otp,vic/otp,NOMORECOFFEE/otp,jemsbhai/otp,VincentHHL/otp,schlagert/otp,isvilen/otp,paulcager/otp,neeraj9/otp,weisslj/otp,falkevik/otp,bugs-erlang-org/otp,jamesruan/otp,psyeugenic/otp,lianghaivv/otp,schlagert/otp,c-rack/otp,mikpe/otp,RoadRunnr/otp,sitexa/otp,RJ/otp,c-rack/otp,erlang/otp,mujiatong/otp,neeraj9/otp,benoitc/otp-1,enikki/otp,riverrun/otp,release-project/otp,RGafiyatullin/otp,GinjaNinja32/otp,riverrun/otp,emile/otp,goertzenator/otp,klarna/otp,emile/otp,dgud/otp,cnbin/otp,weisslj/otp,VincentHHL/otp,benoitc/otp-1,ahmedshafeeq/otp,derek121/otp,cnbin/otp,getong/otp,benoitc/otp-1,jamesruan/otp,jinshana/otp,saleyn/otp,massemanet/otp,rlipscombe/otp,RoadRunnr/otp,fenollp/otp,derek121/otp,lhslll/otp,uabboli/otp,vladdu/otp,vic/otp,bjorng/otp,saleyn/otp,RoadRunnr/otp,mujiatong/otp,mujiatong/otp,msantos/otp,enikki/otp,lemenkov/otp,bsmr-erlang/otp,jj1bdx/otp,ferd/otp,vic/otp,basho/otp,goertzenator/otp,paulcager/otp,uabboli/otp,vic/otp,NOMORECOFFEE/otp,riverrun/otp,Teino1978-Corp/erlang-otp,NOMORECOFFEE/otp,benoitc/otp-1,sammoth-wazoku/otp,VincentHHL/otp,legoscia/otp,jemsbhai/otp,cnbin/otp,bugs-erlang-org/otp,isvilen/otp,cnbin/otp,sdebnath/otp,release-project/otp,palas/otp,awetzel/otp,dumbbell/otp,basho/otp,kvakvs/otp,VincentHHL/otp,johanclaesson/otp,paulcager/otp,theom/otp,basho/otp,riverrun/otp,lightcyphers/otp,mujiatong/otp,isvilen/otp,gjaldon/otp,legoscia/otp,ferd/otp,bernardd/otp,bsmr-erlang/otp,paulcager/otp,potatosalad/otp,Teino1978-Corp/erlang-otp,lantti/otp,g-andrade/otp,awetzel/otp,ferd/otp,aboroska/otp,massemanet/otp,lrascao/otp,RoadRunnr/otp,neeraj9/otp,rlipscombe/otp,electricimp/otp,sitexa/otp,ader1990/otp,lhslll/otp,Teino1978-Corp/erlang-otp,saleyn/otp,cnbin/otp,klarna/otp,lemenkov/otp,jinshana/otp,dgud/otp,ader1990/otp,vinoski/otp,falkevik/otp,entropiae/otp,dgud/otp,basho/otp,potatosalad/otp,emacsmirror/erlang,electricimp/otp,aboroska/otp,palas/otp,paladim/otp,bjorng/otp,electricimp/otp,bjorng/otp,theom/otp,jemsbhai/otp,lrascao/otp,cnbin/otp,fenollp/otp,fenollp/otp,jj1bdx/otp,uabboli/otp,gjaldon/otp,beni55/otp,bugs-erlang-org/otp,paladim/otp,rlipscombe/otp,mujiatong/otp,jamesruan/otp,matwey/otp,lemenkov/otp,vinoski/otp,Teino1978-Corp/otp,bugs-erlang-org/otp,jemsbhai/otp,massemanet/otp,bsmr-erlang/otp,enikki/otp,matwey/otp,emacsmirror/erlang