Don't crash on prompt cancel.
Don't crash on prompt cancel.

gupta137/blockly,MikeDX/blockly-div,Program-AR/blockly,yhbest/blockly,paulweatherby/blockly,ChinJY/blockly,caiograg/blockly,nickmain/blockly,charlynz/blockly-adventure,ylixir/blockly,twodee/blockly,LLK/scratch-blocks,shyamalschandra/blockly,InspectorWidget/blockly,trodi/blockly,michalkilawok/blockly,xeecos/blockly,jstnhuang/blockly,andersschuller/blockly,lzairdking/blockly,OpenRoberta/blockly,sonwh98/blockly,trinketapp/blockly,griffpatch/scratch-blocks,zerar/blockly,Immortalin/blockly,Immortalin/blockly,gupta137/blockly,Kaworru/blockly,gengshenghong/scratch-blocks,jano42/blockly,trinketapp/blockly,eclecticdave/blockly,joshlory/blockly,edbutler/blockly,paulweatherby/blockly,gengshenghong/scratch-blocks,prappo/blockly,in1004kyu/tokitool,markocelan/blockly-minecraft,Andrews9008/blockly,gabrielsanchez/blockly,OpenRoberta/blockly,michalkilawok/blockly,Jhara/blockly,marianoguerra/blockly,mark-friedman/blockly,zerar/blockly,CocoMake7/CocoBlockly,hkoi/blockly,rasata/blockly,EmergingTechnologyAdvisors/blockly,CocoMake7/CocoBlockly,rachel-fenichel/blockly,twodee/blockly,dhalupa/blockly,ominux/blockly,jstnhuang/blockly,andersschuller/blockly,JackBDu/blockly,ChinJY/blockly,orionhealth/blockly,LLK/scratch-blocks,mark-friedman/blockly,groklearning/blockly,jordicamposmiralles/geoblockly,rachel-fenichel/blockly,nickmain/blockly,rasata/blockly,RealTimeWeb/blockpy,eclecticdave/blockly,ymnk13/blockly,carlosperate/ardublockly,sonwh98/blockly,faizshukri/blockly,carlosperate/ardublockly,orionhealth/blockly,vinay5jan/blocklyExtended,jisqyv/blockly,paulweatherby/blockly,twodee/blockly,Grahack/blockly,moskalevkirll/blockly,adrgerez/ardublockly,dhalupa/blockly,LLK/scratch-blocks,cmillani/blockly,toebes-extreme/blockly,griffpatch/scratch-blocks,Tinkerforge/tvpl-blockly,jano42/blockly,thekoalaz/blockly,thekoalaz/blockly,SheldonPacotti/blockly-enhancements,cmillani/blockly,michalkilawok/blockly,yhbest/blockly,HALtheWise/blockly,google/blockly,moskalevkirll/blockly,Gamefroot/Gamefroot-Blockly,MaryS94/blockly,charlynz/blockly-adventure,stefan-j/blockly,simpleverso/blockly,mehrdadrafiee/blockly,daarond/blockly,twodee/blockly,joshlory/blockly,HALtheWise/blockly,mark-friedman/blockly,carloslfu/blockly,TechplexEngineer/blockly,aninternetof/blockly,carloslfu/blockly,Kaworru/blockly,RealTimeWeb/blockly,aravart/speech-blocks,jstnhuang/blockly,rachel-fenichel/blockly,Gamefroot/Gamefroot-Blockly,sclements/scratch-blocks,hybrideagle/blockly,cdjackson/openhab-blockly,hybrideagle/blockly,LLK/scratch-blocks,simpleverso/blockly,google/blockly-devtools,TechplexEngineer/blockly,trinketapp/blockly,ocadotechnology/blockly,gabrielsanchez/blockly,edbutler/blockly,rachel-fenichel/blockly,aseba-community/blockly,OpenRoberta/blockly,kingoo/blockly,trinketapp/blockly,InspectorWidget/blockly,stefan-j/blockly,shabesoglu/blockly,aninternetof/blockly,toebes-extreme/blockly,google/blockly,Jhara/blockly,LLK/scratch-blocks,UIKit0/blockly,ensonic/blockly,trodi/blockly,SheldonPacotti/blockly-enhancements,prappo/blockly,UIKit0/blockly,smalruby/blockly,aninternetof/blockly,smalruby/blockly,wakashige/blockly,toebes-extreme/blockly,thekoalaz/blockly,in1004kyu/tokitool,EinsteinsWorkshop/blockly,altereagle/blockly,nickmain/blockly,adrgerez/ardublockly,lzairdking/blockly,picklesrus/blockly,jisqyv/blockly,gasolin/blockly,stefan-j/blockly,griffpatch/scratch-blocks,xeecos/blockly,OpenRoberta/blockly,touqir14/blockly,hkoi/blockly,3agv2004/Programming,rdelhommer/BlocklyPrototypeEB,ymnk13/blockly,kingoo/blockly,gengshenghong/scratch-blocks,andersschuller/blockly,joshlory/blockly,Tinkerforge/tvpl-blockly,krahman/blockly,EmergingTechnologyAdvisors/blockly,shyamalschandra/blockly,trodi/blockly,gudtago/blockly,MikeDX/blockly-div,josmas/blockly,ylixir/blockly,Gamefroot/Gamefroot-Blockly,carlosperate/blockly,faizshukri/blockly,altereagle/blockly,RealTimeWeb/blockly,shabesoglu/blockly,faizshukri/blockly,UIKit0/blockly,Program-AR/blockly,vinay5jan/blocklyExtended,markocelan/blockly-minecraft,picklesrus/blockly,marianoguerra/blockly,dhalupa/blockly,carlosperate/ardublockly,rdelhommer/BlocklyPrototypeEB,groklearning/blockly,google/blockly-devtools,xeecos/blockly,groklearning/blockly,ralic/blockly,edbutler/blockly,mark-friedman/blockly,nickmain/blockly,touqir14/blockly,markocelan/blockly-minecraft,thr0w/blockly,sclements/scratch-blocks,twodee/blockly,carloslfu/blockly,ChinJY/blockly,sonwh98/blockly,EinsteinsWorkshop/blockly,sclements/scratch-blocks,Program-AR/blockly,mark-friedman/blockly,MoziSong/blockly_dyn_devices,InspectorWidget/blockly,josmas/blockly,gupta137/blockly,MoziSong/blockly_dyn_devices,ominux/blockly,MikeDX/blockly-div,nickmain/blockly,griffpatch/scratch-blocks,rachel-fenichel/blockly,ensonic/blockly,griffpatch/scratch-blocks,shyamalschandra/blockly,wakashige/blockly,Grahack/blockly,gabrielsanchez/blockly,aseba-community/blockly,Immortalin/blockly,groklearning/blockly,hkoi/blockly,drigz/blockly,ocadotechnology/blockly,caiograg/blockly,thr0w/blockly,3agv2004/Programming,Grahack/blockly,stefan-j/blockly,hybrideagle/blockly,adrgerez/ardublockly,caiograg/blockly,zerar/blockly,MoziSong/blockly_dyn_devices,CocoMake7/CocoBlockly,cdjackson/openhab-blockly,HALtheWise/blockly,krahman/blockly,mehrdadrafiee/blockly,gengshenghong/scratch-blocks,ralic/blockly,carlosperate/blockly,cmillani/blockly,google/blockly,in1004kyu/tokitool,daarond/blockly,jstnhuang/blockly,sclements/scratch-blocks,ymnk13/blockly,Tinkerforge/tvpl-blockly,g-rocket/blockly,Kaworru/blockly,simpleverso/blockly,RealTimeWeb/blockpy,RealTimeWeb/blockpy,rachel-fenichel/blockly,rasata/blockly,SheldonPacotti/blockly-enhancements,moskalevkirll/blockly,ensonic/blockly,sclements/scratch-blocks,picklesrus/blockly,lzairdking/blockly,Gamefroot/Gamefroot-Blockly,ylixir/blockly,RealTimeWeb/blockly,drigz/blockly,prappo/blockly,EmergingTechnologyAdvisors/blockly,lzairdking/blockly,marianoguerra/blockly,g-rocket/blockly,Andrews9008/blockly,nickmain/blockly,thr0w/blockly,ralic/blockly,EinsteinsWorkshop/blockly,josmas/blockly,google/blockly,yhbest/blockly,JackBDu/blockly,twodee/blockly,gudtago/blockly,ocadotechnology/blockly,jordicamposmiralles/geoblockly,MaryS94/blockly,gengshenghong/scratch-blocks,gasolin/blockly,jordicamposmiralles/geoblockly,google/blockly,markocelan/blockly-minecraft,trodi/blockly,carlosperate/blockly,Jhara/blockly,altereagle/blockly,cdjackson/openhab-blockly,orionhealth/blockly,aravart/speech-blocks,MaryS94/blockly,carlosperate/blockly,drigz/blockly,google/blockly,jano42/blockly,jisqyv/blockly,vinay5jan/blocklyExtended,wakashige/blockly,shabesoglu/blockly,aseba-community/blockly,gudtago/blockly,JackBDu/blockly,touqir14/blockly,Andrews9008/blockly,ominux/blockly,g-rocket/blockly,jano42/blockly,rachel-fenichel/blockly,eclecticdave/blockly,google/blockly,gasolin/blockly,3agv2004/Programming,daarond/blockly,mark-friedman/blockly,kingoo/blockly