css: Fix emoji reactions jolt and padding issues.
css: Fix emoji reactions jolt and padding issues.

This fixes two issues:

* If you had around 10 distinct emoji reactions on a message (enough
  to force a line wrap if the add-your-emoji button was visible),
  Zulip would add that button into a new row on hover, jolting the
  message feed.  This fixes that problem by leaving a blank last line
  for the add-your-emoji button.

* We were incorrectly showing the padding for the emoji reactions
  region even if there were no emoji reactions, causing messages to
  have too much padding.

shubhamdhama/zulip,SmartPeople/zulip,kou/zulip,JPJPJPOPOP/zulip,jphilipsen05/zulip,aakash-cr7/zulip,timabbott/zulip,AZtheAsian/zulip,shubhamdhama/zulip,amanharitsh123/zulip,souravbadami/zulip,PhilSk/zulip,punchagan/zulip,jackrzhang/zulip,synicalsyntax/zulip,dhcrzf/zulip,hackerkid/zulip,souravbadami/zulip,brockwhittaker/zulip,tommyip/zulip,dattatreya303/zulip,dawran6/zulip,christi3k/zulip,SmartPeople/zulip,susansls/zulip,shubhamdhama/zulip,showell/zulip,verma-varsha/zulip,dawran6/zulip,blaze225/zulip,jphilipsen05/zulip,vabs22/zulip,shubhamdhama/zulip,blaze225/zulip,PhilSk/zulip,amanharitsh123/zulip,shubhamdhama/zulip,samatdav/zulip,AZtheAsian/zulip,vaidap/zulip,vaidap/zulip,Diptanshu8/zulip,sharmaeklavya2/zulip,sonali0901/zulip,eeshangarg/zulip,rishig/zulip,mahim97/zulip,showell/zulip,jrowan/zulip,kou/zulip,jphilipsen05/zulip,vabs22/zulip,synicalsyntax/zulip,Diptanshu8/zulip,rishig/zulip,sonali0901/zulip,christi3k/zulip,timabbott/zulip,showell/zulip,isht3/zulip,jackrzhang/zulip,Diptanshu8/zulip,ryanbackman/zulip,Diptanshu8/zulip,sharmaeklavya2/zulip,verma-varsha/zulip,showell/zulip,punchagan/zulip,dattatreya303/zulip,mahim97/zulip,souravbadami/zulip,Galexrt/zulip,jainayush975/zulip,j831/zulip,dattatreya303/zulip,blaze225/zulip,PhilSk/zulip,PhilSk/zulip,susansls/zulip,Galexrt/zulip,dattatreya303/zulip,vabs22/zulip,jainayush975/zulip,blaze225/zulip,punchagan/zulip,vabs22/zulip,ryanbackman/zulip,andersk/zulip,rishig/zulip,amyliu345/zulip,timabbott/zulip,synicalsyntax/zulip,sonali0901/zulip,SmartPeople/zulip,brainwane/zulip,isht3/zulip,zulip/zulip,eeshangarg/zulip,JPJPJPOPOP/zulip,souravbadami/zulip,dhcrzf/zulip,tommyip/zulip,jphilipsen05/zulip,rishig/zulip,kou/zulip,shubhamdhama/zulip,eeshangarg/zulip,tommyip/zulip,hackerkid/zulip,showell/zulip,Galexrt/zulip,PhilSk/zulip,Galexrt/zulip,brainwane/zulip,j831/zulip,vaidap/zulip,eeshangarg/zulip,brainwane/zulip,zulip/zulip,brainwane/zulip,jackrzhang/zulip,andersk/zulip,brockwhittaker/zulip,jrowan/zulip,aakash-cr7/zulip,rht/zulip,brockwhittaker/zulip,timabbott/zulip,vaidap/zulip,andersk/zulip,rishig/zulip,showell/zulip,jrowan/zulip,amanharitsh123/zulip,samatdav/zulip,j831/zulip,brockwhittaker/zulip,dawran6/zulip,sonali0901/zulip,AZtheAsian/zulip,AZtheAsian/zulip,jainayush975/zulip,sharmaeklavya2/zulip,susansls/zulip,jainayush975/zulip,jrowan/zulip,jackrzhang/zulip,amanharitsh123/zulip,mahim97/zulip,susansls/zulip,jrowan/zulip,blaze225/zulip,dattatreya303/zulip,amyliu345/zulip,rht/zulip,rht/zulip,samatdav/zulip,zulip/zulip,timabbott/zulip,isht3/zulip,AZtheAsian/zulip,vabs22/zulip,vabs22/zulip,tommyip/zulip,synicalsyntax/zulip,vaidap/zulip,rht/zulip,dawran6/zulip,blaze225/zulip,Diptanshu8/zulip,verma-varsha/zulip,brockwhittaker/zulip,susansls/zulip,kou/zulip,sonali0901/zulip,andersk/zulip,dawran6/zulip,jphilipsen05/zulip,zulip/zulip,isht3/zulip,jphilipsen05/zulip,eeshangarg/zulip,samatdav/zulip,timabbott/zulip,dhcrzf/zulip,aakash-cr7/zulip,mahim97/zulip,samatdav/zulip,hackerkid/zulip,hackerkid/zulip,ryanbackman/zulip,zulip/zulip,aakash-cr7/zulip,rht/zulip,Galexrt/zulip,jainayush975/zulip,zulip/zulip,brockwhittaker/zulip,verma-varsha/zulip,JPJPJPOPOP/zulip,kou/zulip,zulip/zulip,j831/zulip,dawran6/zulip,sharmaeklavya2/zulip,sonali0901/zulip,AZtheAsian/zulip,PhilSk/zulip,vaidap/zulip,rht/zulip,christi3k/zulip,JPJPJPOPOP/zulip,amyliu345/zulip,ryanbackman/zulip,jackrzhang/zulip,dhcrzf/zulip,dhcrzf/zulip,ryanbackman/zulip,brainwane/zulip,synicalsyntax/zulip,tommyip/zulip,andersk/zulip,jackrzhang/zulip,synicalsyntax/zulip,showell/zulip,hackerkid/zulip,andersk/zulip,rishig/zulip,sharmaeklavya2/zulip,christi3k/zulip,christi3k/zulip,timabbott/zulip,mahim97/zulip,verma-varsha/zulip,rht/zulip,dhcrzf/zulip,brainwane/zulip,j831/zulip,aakash-cr7/zulip,souravbadami/zulip,punchagan/zulip,tommyip/zulip,shubhamdhama/zulip,synicalsyntax/zulip,amyliu345/zulip,sharmaeklavya2/zulip,SmartPeople/zulip,isht3/zulip,samatdav/zulip,Galexrt/zulip,JPJPJPOPOP/zulip,Diptanshu8/zulip,jainayush975/zulip,isht3/zulip,j831/zulip,amyliu345/zulip,amanharitsh123/zulip,SmartPeople/zulip,JPJPJPOPOP/zulip,rishig/zulip,susansls/zulip,hackerkid/zulip,christi3k/zulip,punchagan/zulip,dattatreya303/zulip,eeshangarg/zulip,tommyip/zulip,punchagan/zulip,hackerkid/zulip,mahim97/zulip,amyliu345/zulip,punchagan/zulip,souravbadami/zulip,eeshangarg/zulip,jackrzhang/zulip,kou/zulip,andersk/zulip,SmartPeople/zulip,jrowan/zulip,kou/zulip,aakash-cr7/zulip,brainwane/zulip,ryanbackman/zulip,verma-varsha/zulip,dhcrzf/zulip,amanharitsh123/zulip,Galexrt/zulip