Fix usage of Http404 in admin page
Fix usage of Http404 in admin page

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

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