fix(tooltip): correct flash of reposition
fix(tooltip): correct flash of reposition

- Avoid position computation when tooltip is empty
- Force visibility to none when resetting style

Closes #4363
Fixes #4195

JDeuker/bootstrap,dmc2015/bootstrap,filso/bootstrap,bikegriffith/bootstrap,carlosjunior/bootstrap,liiza/bootstrap,WXwangxin/bootstrap,christor/bootstrap,ksheedlo/bootstrap,maoli1110/bootstrap,dmc2015/bootstrap,ehteshamkafeel/bootstrap,yjukaku/bootstrap,benhalverson/bootstrap,carlosjunior/bootstrap,cesarmarinhorj/AngularJS-bootstrap,angular-ui/bootstrap,Schibum/bootstrap,kmccaw/bootstrap,byronigoe/bootstrap,fpipita/bootstrap,2363140194/bootstrap,matteopic/bootstrap,yjukaku/bootstrap,JDeuker/bootstrap,themifycloud/bootstrap,jaydiablo/bootstrap,GirishKumrawat/bootstrap,infowrap/bootstrap,rajesh-frontendengineer/bootstrap-1,mabi/bootstrap,infowrap/bootstrap,292388900/bootstrap,pireerliu/bootstrap,finkcloud/bootstrap,yubin-huang/bootstrap,rodrigues-daniel/bootstrap,realityking/ui-bootstrap,oliversalzburg/bootstrap,voyagecontrol/bootstrap,elancom/bootstrap-1,codedogfish/angular-ui-bootstrap,gorork/bootstrap,lancerushing/bootstrap,SimilarWeb/bootstrap,mufl1h/bootstrap,deeg/bootstrap,nathan-j-brenner/bootstrap-1,kemapak/bootstrap,franzherzog/bootstrap,universsky/bootstrap-1,burlhock/bootstrap,leyanlo/bootstrap,vfiles/bootstrap,BookingBug/bootstrap,thomassorensen/bootstrap,woshiyigebing/bootstrap,davious/angular-ui-bootstrap,parikmaher534/bootstrap,gorork/bootstrap,edivancamargo/bootstrap,thalen/bootstrap,linuxb/bootstrap,bikegriffith/bootstrap,thomassorensen/bootstrap,mikesavior/bootstrap,vsternbach/bootstrap,stereocilia/bootstrap,spadgett/bootstrap,mikesavior/bootstrap,Vreasy/bootstrap,finkcloud/bootstrap,looker/bootstrap,Zazulei/bootstrap,fabg21/bootstrap,rodrigues-daniel/bootstrap,leyanlo/bootstrap,franzherzog/bootstrap,SystemDisc/bootstrap,stereocilia/bootstrap,Kpler/bootstrap,cesarmarinhorj/AngularJS-bootstrap,shootermv/bootstrap,benhalverson/bootstrap,alokpradhan/bootstrap,madhudskumar/bootstrap,mufl1h/bootstrap,parikmaher534/bootstrap,voyagecontrol/bootstrap,Foxandxss/bootstrap,Kpler/bootstrap,fabg21/bootstrap,Nekle/bootstrap,liiza/bootstrap,benhalverson/bootstrap,burlhock/bootstrap,maoli1110/bootstrap,caoruiy/bootstrap,rhamid/bootstrap-1,kongx73/bootstrap,BookingBug/bootstrap,mabi/bootstrap,KingMario/bootstrap-1,Schibum/bootstrap,cdrewery/bootstrap,davious/angular-ui-bootstrap,realityking/ui-bootstrap,guaido79/bootstrap,christor/bootstrap,Gailby/bootstrap,rajesh-frontendengineer/bootstrap-1,inukshuk/bootstrap,kemapak/bootstrap,kirning/bootstrap-1,zhaokunfay/bootstrap,TORO-IO/bootstrap-1,woshiyigebing/bootstrap,Vreasy/bootstrap,matteopic/bootstrap,TORO-IO/bootstrap-1,292388900/bootstrap,icfantv/bootstrap,madhudskumar/bootstrap,shadowdaw/bootstrap,SimilarWeb/bootstrap,sullivanpt/bootstrap,Anirudhk94/bootstrap,wesleycho/bootstrap,shadowdaw/bootstrap,jaydiablo/bootstrap,cdrewery/bootstrap,rasulnz/bootstrap,guaido79/bootstrap,kongx73/bootstrap,JonFerrera/ui-bootstrap,connyay/bootstrap,vsternbach/bootstrap,looker/bootstrap,Zazulei/bootstrap,yukisan/bootstrap,inoxis91/bootstrap,WXwangxin/bootstrap,cgvarela/bootstrap-1,zhaokunfay/bootstrap,Xephi/bootstrap,Foxandxss/bootstrap,SystemDisc/bootstrap,justin-john/bootstrap-1,liqingzhu/bootstrap,azahreba/bootstrap,linuxvom/bootstrap,dsisejkovic/bootstrap,ehteshamkafeel/bootstrap,deeg/bootstrap,cgvarela/bootstrap-1,filso/bootstrap,sullivanpt/bootstrap,shiftagent/ui-bootstrap,shihang0001/bootstrap,byronigoe/bootstrap,spadgett/bootstrap,kirning/bootstrap-1,jackRogers/bootstrap,codedogfish/angular-ui-bootstrap,atulc007/bootstrap-1,nathan-j-brenner/bootstrap-1,linuxb/bootstrap,jackRogers/bootstrap,shootermv/bootstrap,KingMario/bootstrap-1,caoruiy/bootstrap,tobigun/bootstrap,Lincoln-xzc/angular-ui-bootstrap,justin-john/bootstrap-1,liqingzhu/bootstrap,wesleycho/bootstrap,Nekle/bootstrap,lancerushing/bootstrap,Servoy/bootstrap,karelcallens/bootstrap,RobJacobs/bootstrap,Lincoln-xzc/angular-ui-bootstrap,GirishKumrawat/bootstrap,alokpradhan/bootstrap,pdsoftplan/bootstrap,inoxis91/bootstrap,tmcgee123/bootstrap,jordangraft/bootstrap,dsisejkovic/bootstrap,shiftagent/ui-bootstrap,eduncan26/bootstrap,edivancamargo/bootstrap,vfiles/bootstrap,Servoy/bootstrap,thalen/bootstrap,karelcallens/bootstrap,2363140194/bootstrap,Anirudhk94/bootstrap,eduncan26/bootstrap,pireerliu/bootstrap,rasulnz/bootstrap,tmcgee123/bootstrap,linuxvom/bootstrap,RobJacobs/bootstrap,angular-ui/bootstrap,pmalikbtech/bootstrap,atulc007/bootstrap-1,Xephi/bootstrap,pdsoftplan/bootstrap,JonFerrera/ui-bootstrap,rhamid/bootstrap-1,pmalikbtech/bootstrap,yukisan/bootstrap,inukshuk/bootstrap,ksheedlo/bootstrap,SatvikPurohit/bootstrap,SatvikPurohit/bootstrap,azahreba/bootstrap,yubin-huang/bootstrap,kmccaw/bootstrap,tobigun/bootstrap,themifycloud/bootstrap,fpipita/bootstrap,jordangraft/bootstrap,icfantv/bootstrap,universsky/bootstrap-1,Gailby/bootstrap,elancom/bootstrap-1,benhalverson/bootstrap,oliversalzburg/bootstrap,shihang0001/bootstrap,connyay/bootstrap