[jsx mode] Return empty token when switching inner modes
[jsx mode] Return empty token when switching inner modes

So that addModeClass sees the right mode for the token

Issue #3745

rrandom/CodeMirror,namin/CodeMirror,hccampos/CodeMirror,INTELOGIE/CodeMirror,ashmind/CodeMirror,jayaprabhakar/CodeMirror,ficristo/CodeMirror,alur/CodeMirror,MarcelGerber/CodeMirror,Jisuanke/CodeMirror,codio/CodeMirror,jkaplon/CodeMirror,dperetti/CodeMirror,pabloferz/CodeMirror,MarcelGerber/CodeMirror,bfrohs/CodeMirror,SidPresse/CodeMirror,ejgallego/CodeMirror,namin/CodeMirror,schanzer/CodeMirror,antimatter15/CodeMirror,antimatter15/CodeMirror,mtaran-google/CodeMirror,InternetGuru/CodeMirror,pabloferz/CodeMirror,notepadqq/CodeMirror,TDaglis/CodeMirror,ashmind/CodeMirror,schanzer/CodeMirror,antimatter15/CodeMirror,ficristo/CodeMirror,crazy4chrissi/CodeMirror,grzegorzmazur/CodeMirror,bfrohs/CodeMirror,mizchi/CodeMirror,jayaprabhakar/CodeMirror,ejgallego/CodeMirror,nightwing/CodeMirror,mizchi/CodeMirror,nightwing/CodeMirror,adobe/CodeMirror2,crazy4chrissi/CodeMirror,Jisuanke/CodeMirror,wingify/CodeMirror,schanzer/CodeMirror,ashmind/CodeMirror,kerabromsmu/CodeMirror,grzegorzmazur/CodeMirror,Dominator008/CodeMirror,jayaprabhakar/CodeMirror,sourcelair/CodeMirror,namin/CodeMirror,hackmdio/CodeMirror,mtaran-google/CodeMirror,hccampos/CodeMirror,MarcelGerber/CodeMirror,hackmdio/CodeMirror,kerabromsmu/CodeMirror,INTELOGIE/CodeMirror,ficristo/CodeMirror,crazy4chrissi/CodeMirror,SidPresse/CodeMirror,jkaplon/CodeMirror,sourcelair/CodeMirror,Dominator008/CodeMirror,INTELOGIE/CodeMirror,notepadqq/CodeMirror,dperetti/CodeMirror,codio/CodeMirror,wingify/CodeMirror,alur/CodeMirror,mizchi/CodeMirror,vincentwoo/CodeMirror,kerabromsmu/CodeMirror,alur/CodeMirror,TDaglis/CodeMirror,bfrohs/CodeMirror,grzegorzmazur/CodeMirror,rrandom/CodeMirror,thomasjm/CodeMirror,InternetGuru/CodeMirror,adobe/CodeMirror2,TDaglis/CodeMirror,vincentwoo/CodeMirror,thomasjm/CodeMirror,codio/CodeMirror,vincentwoo/CodeMirror,notepadqq/CodeMirror,pabloferz/CodeMirror,mtaran-google/CodeMirror,Jisuanke/CodeMirror,sourcelair/CodeMirror,xeronith/CodeMirror,xeronith/CodeMirror,hackmdio/CodeMirror,SidPresse/CodeMirror,adobe/CodeMirror2,rrandom/CodeMirror,ejgallego/CodeMirror,thomasjm/CodeMirror,wingify/CodeMirror,xeronith/CodeMirror,nightwing/CodeMirror,Dominator008/CodeMirror,hccampos/CodeMirror,InternetGuru/CodeMirror,dperetti/CodeMirror,jkaplon/CodeMirror