Fix bug that $set and $unset categories same time.
Fix bug that $set and $unset categories same time.

Fix #1150

bengott/Telescope,aykutyaman/Telescope,aykutyaman/Telescope,SachaG/Gamba,Discordius/Telescope,julienlapointe/telescope-nova-social-news,youprofit/Telescope,Daz2345/dhPulse,johndpark/Telescope,kakedis/Telescope,Discordius/Telescope,TodoTemplates/Telescope,Daz2345/Telescope,basemm911/questionsociety,metstrike/Telescope,eruwinu/presto,julienlapointe/telescope-nova-social-news,basemm911/questionsociety,acidsound/Telescope,SachaG/Gamba,nhlennox/gbjobs,capensisma/Asteroid,jonmc12/heypsycho,nathanmelenbrink/theRecord,johndpark/Telescope,huaiyudavid/rentech,evilhei/itForum,TribeMedia/Telescope,azukiapp/Telescope,dominictracey/Telescope,metstrike/Telescope,Discordius/Lesswrong2,VulcanJS/Vulcan,aichane/digigov,TribeMedia/Telescope,johndpark/Telescope,tupeloTS/grittynashville,delgermurun/Telescope,huaiyudavid/rentech,tupeloTS/telescopety,ahmadassaf/Telescope,automenta/sernyl,SachaG/swpsub,capensisma/Asteroid,SachaG/swpsub,TelescopeJS/Screenings,hoihei/Telescope,HelloMeets/HelloMakers,aozora/Telescope,aichane/digigov,TodoTemplates/Telescope,bshenk/projectIterate,acidsound/Telescope,Daz2345/Telescope,StEight/Telescope,TelescopeJS/Screenings,tupeloTS/grittynashville,Discordius/Lesswrong2,azukiapp/Telescope,Air2air/Telescope,ahmadassaf/Telescope,JstnEdr/Telescope,Daz2345/dhPulse,kakedis/Telescope,aichane/digigov,edjv711/presto,nathanmelenbrink/theRecord,tupeloTS/telescopety,Daz2345/Telescope,edjv711/presto,SachaG/Zensroom,jonmc12/heypsycho,codebuddiesdotorg/cb-v2,azukiapp/Telescope,rtluu/immersive,dominictracey/Telescope,bshenk/projectIterate,ahmadassaf/Telescope,hoihei/Telescope,Discordius/Telescope,rtluu/immersive,bengott/Telescope,kakedis/Telescope,StEight/Telescope,bharatjilledumudi/india-shop,huaiyudavid/rentech,codebuddiesdotorg/cb-v2,tupeloTS/telescopety,JstnEdr/Telescope,automenta/sernyl,dominictracey/Telescope,nhlennox/gbjobs,Air2air/Telescope,aozora/Telescope,Discordius/Lesswrong2,aykutyaman/Telescope,SachaG/bjjbot,manriquef/Vulcan,youprofit/Telescope,acidsound/Telescope,bshenk/projectIterate,edjv711/presto,SachaG/Zensroom,TodoTemplates/Telescope,julienlapointe/telescope-nova-social-news,metstrike/Telescope,TelescopeJS/Screenings,eruwinu/presto,VulcanJS/Vulcan,bharatjilledumudi/india-shop,SachaG/Gamba,HelloMeets/HelloMakers,Daz2345/dhPulse,nathanmelenbrink/theRecord,SachaG/bjjbot,jonmc12/heypsycho,delgermurun/Telescope,HelloMeets/HelloMakers,manriquef/Vulcan,Discordius/Lesswrong2,hoihei/Telescope,SachaG/swpsub,Air2air/Telescope,automenta/sernyl,capensisma/Asteroid,tupeloTS/grittynashville,Discordius/Telescope,youprofit/Telescope,aozora/Telescope,evilhei/itForum,JstnEdr/Telescope,basemm911/questionsociety,TribeMedia/Telescope,eruwinu/presto,StEight/Telescope,SachaG/Zensroom,manriquef/Vulcan,bengott/Telescope,evilhei/itForum,delgermurun/Telescope,rtluu/immersive,SachaG/bjjbot,bharatjilledumudi/india-shop,nhlennox/gbjobs,codebuddiesdotorg/cb-v2