Only create the automatic groups if no groups exist
Only create the automatic groups if no groups exist

The only time no groups exist in the data store is when
we have a brand new installation of Gerrit and we have
not yet created the automatic groups.

Signed-off-by: Shawn O. Pearce <f3ea74d906fa9fe97c1fef6bad9cb871485c7045@google.com>

midnightradio/gerrit,netroby/gerrit,thinkernel/gerrit,evanchueng/gerrit,bpollack/gerrit,gcoders/gerrit,atdt/gerrit,1yvT0s/gerrit,gracefullife/gerrit,WANdisco/gerrit,TonyChai24/test,makholm/gerrit-ceremony,ckamm/gerrit,keerath/gerrit_newssh,joshuawilson/merrit,joshuawilson/merrit,thinkernel/gerrit,netroby/gerrit,GerritCodeReview/gerrit-attic,basilgor/gerrit,rtyley/mini-git-server,pkdevbox/gerrit,quyixia/gerrit,keerath/gerrit_newssh,Saulis/gerrit,joshuawilson/merrit,catrope/gerrit,joshuawilson/merrit,hdost/gerrit,1yvT0s/gerrit,dwhipstock/gerrit,qtproject/qtqa-gerrit,supriyantomaftuh/gerrit,dwhipstock/gerrit,sudosurootdev/gerrit,thesamet/gerrit,Shrews/PyGerrit,netroby/gerrit,catrope/gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,bootstraponline-archive/gerrit-mirror,bootstraponline-archive/gerrit-mirror,joshuawilson/merrit,Distrotech/gerrit,thinkernel/gerrit,Saulis/gerrit,qtproject/qtqa-gerrit,MerritCR/merrit,bpollack/gerrit,ckamm/gerrit,Seinlin/gerrit,austinchic/Gerrit,quyixia/gerrit,gerrit-review/gerrit,Overruler/gerrit,supriyantomaftuh/gerrit,Team-OctOS/host_gerrit,cjh1/gerrit,skurfuerst/gerrit,GerritCodeReview/gerrit,CandyShop/gerrit,gerrit-review/gerrit,Saulis/gerrit,atdt/gerrit,basilgor/gerrit,gerrit-review/gerrit,Overruler/gerrit,Team-OctOS/host_gerrit,Saulis/gerrit,bootstraponline-archive/gerrit-mirror,jackminicloud/test,zommarin/gerrit,jackminicloud/test,gracefullife/gerrit,quyixia/gerrit,teamblueridge/gerrit,Saulis/gerrit,TonyChai24/test,Seinlin/gerrit,Seinlin/gerrit,renchaorevee/gerrit,midnightradio/gerrit,midnightradio/gerrit,austinchic/Gerrit,jackminicloud/test,quyixia/gerrit,MerritCR/merrit,anminhsu/gerrit,quyixia/gerrit,jackminicloud/test,Distrotech/gerrit,anminhsu/gerrit,MerritCR/merrit,WANdisco/gerrit,Overruler/gerrit,Overruler/gerrit,skurfuerst/gerrit,CandyShop/gerrit,hdost/gerrit,atdt/gerrit,duboisf/gerrit,thinkernel/gerrit,ckamm/gerrit,dwhipstock/gerrit,zommarin/gerrit,keerath/gerrit_newssh,midnightradio/gerrit,anminhsu/gerrit,renchaorevee/gerrit,m1kah/gerrit-contributions,gcoders/gerrit,midnightradio/gerrit,MerritCR/merrit,bpollack/gerrit,sudosurootdev/gerrit,bpollack/gerrit,qtproject/qtqa-gerrit,CandyShop/gerrit,netroby/gerrit,catrope/gerrit,zommarin/gerrit,supriyantomaftuh/gerrit,Team-OctOS/host_gerrit,GerritCodeReview/gerrit,gerrit-review/gerrit,catrope/gerrit,jeblair/gerrit,dwhipstock/gerrit,jackminicloud/test,evanchueng/gerrit,Distrotech/gerrit,Distrotech/gerrit,Team-OctOS/host_gerrit,Distrotech/gerrit,MerritCR/merrit,thinkernel/gerrit,gracefullife/gerrit,thinkernel/gerrit,thesamet/gerrit,gcoders/gerrit,joshuawilson/merrit,jackminicloud/test,GerritCodeReview/gerrit,WANdisco/gerrit,ckamm/gerrit,jackminicloud/test,MerritCR/merrit,hdost/gerrit,austinchic/Gerrit,hdost/gerrit,Shrews/PyGerrit,pkdevbox/gerrit,midnightradio/gerrit,ashang/aaron-gerrit,anminhsu/gerrit,bpollack/gerrit,anminhsu/gerrit,gerrit-review/gerrit,thesamet/gerrit,evanchueng/gerrit,ashang/aaron-gerrit,TonyChai24/test,thesamet/gerrit,austinchic/Gerrit,evanchueng/gerrit,cjh1/gerrit,netroby/gerrit,thesamet/gerrit,skurfuerst/gerrit,atdt/gerrit,GerritCodeReview/gerrit,gcoders/gerrit,jeblair/gerrit,renchaorevee/gerrit,1yvT0s/gerrit,ashang/aaron-gerrit,pkdevbox/gerrit,hdost/gerrit,jeblair/gerrit,renchaorevee/gerrit,basilgor/gerrit,duboisf/gerrit,bpollack/gerrit,thesamet/gerrit,Shrews/PyGerrit,anminhsu/gerrit,bootstraponline-archive/gerrit-mirror,MerritCR/merrit,Overruler/gerrit,gracefullife/gerrit,basilgor/gerrit,thesamet/gerrit,gcoders/gerrit,Seinlin/gerrit,Seinlin/gerrit,Seinlin/gerrit,GerritCodeReview/gerrit,evanchueng/gerrit,TonyChai24/test,basilgor/gerrit,hdost/gerrit,thinkernel/gerrit,Team-OctOS/host_gerrit,teamblueridge/gerrit,WANdisco/gerrit,teamblueridge/gerrit,renchaorevee/gerrit,keerath/gerrit_newssh,TonyChai24/test,supriyantomaftuh/gerrit,makholm/gerrit-ceremony,makholm/gerrit-ceremony,supriyantomaftuh/gerrit,Overruler/gerrit,1yvT0s/gerrit,CandyShop/gerrit,WANdisco/gerrit,teamblueridge/gerrit,CandyShop/gerrit,WANdisco/gerrit,qtproject/qtqa-gerrit,bootstraponline-archive/gerrit-mirror,sudosurootdev/gerrit,bootstraponline-archive/gerrit-mirror,ashang/aaron-gerrit,zommarin/gerrit,pkdevbox/gerrit,netroby/gerrit,jeblair/gerrit,Distrotech/gerrit,supriyantomaftuh/gerrit,cjh1/gerrit,gerrit-review/gerrit,gerrit-review/gerrit,Distrotech/gerrit,teamblueridge/gerrit,TonyChai24/test,GerritCodeReview/gerrit,GerritCodeReview/gerrit,sudosurootdev/gerrit,renchaorevee/gerrit,quyixia/gerrit,1yvT0s/gerrit,Team-OctOS/host_gerrit,skurfuerst/gerrit,sudosurootdev/gerrit,GerritCodeReview/gerrit-attic,ashang/aaron-gerrit,GerritCodeReview/gerrit,zommarin/gerrit,Seinlin/gerrit,m1kah/gerrit-contributions,gcoders/gerrit,Team-OctOS/host_gerrit,joshuawilson/merrit,qtproject/qtqa-gerrit,anminhsu/gerrit,hdost/gerrit,renchaorevee/gerrit,rtyley/mini-git-server,pkdevbox/gerrit,joshuawilson/merrit,duboisf/gerrit,m1kah/gerrit-contributions,WANdisco/gerrit,keerath/gerrit_newssh,pkdevbox/gerrit,duboisf/gerrit,gracefullife/gerrit,Saulis/gerrit,MerritCR/merrit,atdt/gerrit,GerritCodeReview/gerrit-attic,makholm/gerrit-ceremony,dwhipstock/gerrit,ckamm/gerrit,dwhipstock/gerrit,dwhipstock/gerrit,pkdevbox/gerrit,supriyantomaftuh/gerrit,TonyChai24/test,quyixia/gerrit,gcoders/gerrit,cjh1/gerrit,Shrews/PyGerrit,netroby/gerrit,m1kah/gerrit-contributions