oestats-client.bbclass: don't include bug number/tracker if empty
oestats-client.bbclass: don't include bug number/tracker if empty

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embedded-rascal,Martix/Eonos,xifengchuo/openembedded,sampov2/audio-openembedded,nlebedenco/mini2440,sampov2/audio-openembedded,hulifox008/openembedded,nx111/openembeded_openpli2.1_nx111,demsey/openembedded,bticino/openembedded,thebohemian/openembedded,sampov2/audio-openembedded,troth/oe-ts7xxx,nvl1109/openembeded,trini/openembedded,popazerty/openembedded-cuberevo,nlebedenco/mini2440,KDAB/OpenEmbedded-Archos,rascalmicro/openembedded-rascal,libo/openembedded,JamesAng/goe,YtvwlD/od-oe,buglabs/oe-buglabs,John-NY/overo-oe,dave-billin/overo-ui-moos-auv,SIFTeam/openembedded,anguslees/openembedded-android,dave-billin/overo-ui-moos-auv,JamesAng/oe,philb/pbcl-oe-2010,trini/openembedded,openembedded/openembedded,demsey/openenigma2,rascalmicro/openembedded-rascal,anguslees/openembedded-android,JrCs/opendreambox,JrCs/opendreambox,openpli-arm/openembedded,crystalfontz/openembedded,popazerty/openembedded-cuberevo,KDAB/OpenEmbedded-Archos,buglabs/oe-buglabs,giobauermeister/openembedded,sentient-energy/emsw-oe-mirror,trini/openembedded,giobauermeister/openembedded,xifengchuo/openembedded,JamesAng/goe,JrCs/opendreambox,JrCs/opendreambox,thebohemian/openembedded,sledz/oe,YtvwlD/od-oe,hulifox008/openembedded,BlackPole/bp-openembedded,sledz/oe,libo/openembedded,sledz/oe,giobauermeister/openembedded,nvl1109/openembeded,philb/pbcl-oe-2010,JamesAng/oe,troth/oe-ts7xxx,crystalfontz/openembedded,nlebedenco/mini2440,giobauermeister/openembedded,dellysunnymtech/sakoman-oe,Martix/Eonos,nlebedenco/mini2440,rascalmicro/openembedded-rascal,giobauermeister/openembedded,mrchapp/arago-oe-dev,dave-billin/overo-ui-moos-auv,anguslees/openembedded-android,sentient-energy/emsw-oe-mirror