refactor(ionNavBackButton): only set scope variable when needed
refactor(ionNavBackButton): only set scope variable when needed

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solutions/ionic,jianganglu/ionic,sthashree/ionic,studio666/ionic,MJefferson/ionic,astagi/ionic,ddddm/ionic,zyaboutblank/ionic,q310550690/ionic,open-anesthesia/ionic,vladipus/ionic,angrilove/ionic,trevorgrayson/ionic,zhonggaoyong/ionic,urish/ionic,lewisl9029/ionic,leerduo/ionic,buiphu/ionic,oneillsp96/ionic,jomaf1010/ionic,thompsonemerson/ionic,GhostGroup/ionic,lutrosis81/manup-app,r14r-work/fork_ionic_master,beauby/ionic,brant-hwang/ionic,PressReader/ionic,zhengqiangzi/ionic,fangjing828/ionic,nelsonsozinho/ionic,TakayukiSakai/ionic,MrChen2015/ionic,bankonme/ionic,r14r-work/fork_ionic_master,yalishizhude/ionic,100goals/ionic,qzapaia/ionic,possan/ionic,studio666/ionic,javascriptit/ionic,ralic/ionic,timtimUp/ionic,puurinternet/ionic,SaadBinShahid/ionic,100goals/ionic,Jeremy017/ionic,TakayukiSakai/ionic,MartinMa/ionic,fanhaich/ionic,baiwyc119/ionic,chinakids/ionic,ezc/ionic,fjzdjd/ionic,glustful/ionic,EricCheung3/ionic,eaglesjava/ionic,VinceOPS/ionic,promactkaran/ionic,celsoyh/ionic,mingming1986/ionic,Nalinc/ionic,envistaInteractive/ionic,r14r/fork_ionic_master,edwardchor/ionic,xzyfer/ionic,cleor41/meteor-ionic,trevorgrayson/ionic,DiZyStudio/ionic,bewebltd/ionic,PaperMonster/ionic,amitparrikar/ionic,femotizo/ionic,baiwyc119/ionic,MrChen2015/ionic,AndyShiTw/ionic,MartinMa/ionic,contigo/ionic,huangsen0912/ionic,954053260/ionic,amitparrikar/ionic,n0b0dy897/ionic,Niades/ionic,gyx8899/ionic,eyalish/ionic,sahat/ionic,amitparrikar/ionic,vladipus/ionic,Gregcop1/ionic,buiphu/ionic,xzyfer/ionic,jgw96/ionic,uus169/ionic,hectoruch/ionic,taraszerebecki/ionic,5amfung/ionic,jango2015/ionic,SobolevLexa/ionic,trevorgrayson/ionic,baiwyc119/ionic,celsoyh/ionic,MarcBT/ionic,huangsen0912/ionic,asfandiyark7/ionic,fanhaich/ionic,tkh44/ionic,chrisbautista/ionic,ptarjan/ionic,jgw96/ionic,cesarmarinhorj/ionic,fanhaich/ionic,jvkops/ionic,Flllexa/ionic,laispace/ionic,x303597316/ionic,MeteorPackaging/ionic,Kryz/ionic,vjrantal/ionic,MartinMa/ionic,PaperMonster/ionic,csbz17027/ionic,wkrueger/ionic,954053260/ionic,felipealbuquerq/ionic,cleor41/meteor-ionic,hectoruch/ionic,hectoruch/ionic,GeorgeMe/ionic,zittix/ionic,fjzdjd/ionic,qzapaia/ionic,sitexa/ionic,oabc124/ionic,zyaboutblank/ionic,r14r-work/fork_ionic,eyalish/ionic,agyrafa/ionic,yanzhihong23/ionic-nono,mingming1986/ionic,fangjing828/ionic,r14r/fork_ionic_master,EricCheung3/ionic,johnli388/ionic,AndyShiTw/ionic,baiwyc119/ionic,GhostGroup/ionic,daew823/ionic,brant-hwang/ionic,jianganglu/ionic,r14r-work/fork_ionic,htc550605125/ionic,SobolevLexa/ionic,mhartington/ionic,xuyuanxiang/ionic,htc550605125/ionic,hotarzhang/ionic,amitparrikar/ionic,pod4g/ionic,thompsonemerson/ionic,leobetosouza/ionic,cesarmarinhorj/ionic,zhiqiangli520210/ionic,nelsonsozinho/ionic,tkh44/ionic,studio666/ionic,SobolevLexa/ionic,michaellourenco/ionic,asfandiyark7/ionic,n0b0dy897/ionic,gyx8899/ionic,nraboy/ionic,felquis/ionic,DurgaprasadPati/ionic,ahmadawais/ionic,AlphaStaxLLC/ionic,GhostGroup/ionic,Nalinc/ionic,studio666/ionic,tkh44/ionic,youprofit/ionic,awhedbee22/ionic,JsonChiu/ionic,cbmeeks/ionic,5amfung/ionic,eaglesjava/ionic,Flllexa/ionic,Niades/ionic,janij/ionic,jayvi/ionic,yanzhihong23/ionic-nono,ctetreault/ionic,WingGao/ionic,leobetosouza/ionic,lewisl9029/ionic,zyaboutblank/ionic,openbizgit/ionic,ezc/ionic,JsonChiu/ionic,leeric92/ionic,glustful/ionic,uidoyen/ionic,edparsons/ionic,ralic/ionic,vjrantal/ionic,zhonggaoyong/ionic,emonidi/ionic,yalishizhude/ionic,TakayukiSakai/ionic,awhedbee22/ionic,felquis/ionic,open-anesthesia/ionic,daew823/ionic,anongtech/ionic,uus169/ionic,thompsonemerson/ionic,fanhaich/ionic,treejames/ionic,huangsen0912/ionic,yurtaev/ionic,PressReader/ionic,freedomdebug/ionic,AlphaStaxLLC/ionic,uus169/ionic,xuyuanxiang/ionic,pargatsingh-webklabs/ionic,qzapaia/ionic,Gregcop1/ionic,janglednerves/ionic,willshen/ionic,sloops77/ionic,ViniciusAugusto/ionic,wkrueger/ionic,KholofeloMoyaba/atajo-ui,mingming1986/ionic,openbizgit/ionic,ngonzalvez/ionic,oabc124/ionic,PaperMonster/ionic,astagi/ionic,mallzee/ionic,vjrantal/ionic,Drok1015/ionic,uidoyen/ionic,954053260/ionic,leeric92/ionic,thebigbrain/ionic,yalishizhude/ionic,jango2015/ionic,KholofeloMoyaba/atajo-ui,fangjing828/ionic,hanmichael/ionic,angrilove/ionic,TakayukiSakai/ionic,zyaboutblank/ionic,edwardchor/ionic,agyrafa/ionic,954053260/ionic,rreinold/FitnessDashboard_IonicApp,100goals/ionic,DiZyStudio/ionic,staney7/ionic,deer-hope/ionic,xuyuanxiang/ionic,jango2015/ionic,Kryz/ionic,hanmichael/ionic,EricCheung3/ionic,urish/ionic,jeremyrussell/ionic,AmberWhiteSky/ionic,jamesdixon/ionic,envistaInteractive/ionic,microlv/ionic,contigo/ionic,janglednerves/ionic,jamesdixon/ionic,janglednerves/ionic,ptarjan/ionic,blueElix/ionic,abcd-ca/ionic,jasdeepkhalsa/ionic,JsonChiu/ionic,nelsonsozinho/ionic,Xeeshan94/ionic,ViniciusAugusto/ionic,JackieLin/ionic,huangsen0912/ionic,wkrueger/ionic,Xeeshan94/ionic,sitacote/ionic-across,ngonzalvez/ionic,lutrosis81/manup-app,Niades/ionic,contigo/ionic,lutrosis81/manup-app,ptarjan/ionic,cbmeeks/ionic,leerduo/ionic,guaerguagua/ionic,eyalish/ionic,JackieLin/ionic,jvkops/ionic,rreinold/FitnessDashboard_IonicApp,celsoyh/ionic,MeteorPackaging/ionic,ahmadawais/ionic,JackieLin/ionic,x303597316/ionic,MarcBT/ionic,Jeremy017/ionic,q310550690/ionic,yurtaev/ionic,leejeap/ionic,eric-stanley/ionic,jgw96/ionic,xuyuanxiang/ionic,daew823/ionic,AmberWhiteSky/ionic,blueElix/ionic,VinceOPS/ionic,thompsonemerson/ionic,possan/ionic,bewebltd/ionic,jeremyrussell/ionic,brant-hwang/ionic,n0b0dy897/ionic,Baskmart/ionic,youprofit/ionic,MrChen2015/ionic,buiphu/ionic,glustful/ionic,hotarzhang/ionic,MrChen2015/ionic,shazhumao/ionic,promactkaran/ionic,Kryz/ionic,willshen/ionic,DiZyStudio/ionic,puurinternet/ionic,rreinold/FitnessDashboard_IonicApp,guaerguagua/ionic,angrilove/ionic,taraszerebecki/ionic,zhengqiangzi/ionic,cleor41/meteor-ionic,Baskmart/ionic,cesarmarinhorj/ionic,ctetreault/ionic,leerduo/ionic,r14r-work/fork_ionic_master,DurgaprasadPati/ionic,possan/ionic,guaerguagua/ionic,Urigo/meteor-ionic,cnbin/ionic,Sourazou/login,gyx8899/ionic,cleor41/meteor-ionic,pargatsingh-webklabs/ionic,SaadBinShahid/ionic,abcd-ca/ionic,jgw96/ionic,yanzhihong23/ionic-nono,Jeremy017/ionic,zhiqiangli520210/ionic,zhengqiangzi/ionic,q310550690/ionic,janglednerves/ionic,staney7/ionic,caiiiycuk/ionic,eric-stanley/ionic,RodrigoIbarraSanchez/ionic,cbmeeks/ionic,DurgaprasadPati/ionic,MarcBT/ionic,n0b0dy897/ionic,Niades/ionic,ctetreault/ionic,ngonzalvez/ionic,LawrenceHan/ionic,sthashree/ionic,eaglesjava/ionic,edwardchor/ionic,DiZyStudio/ionic,Flllexa/ionic,AppGyver/ionic,Testoni/ionic,jango2015/ionic,jasdeepkhalsa/ionic,chinakids/ionic,zhiqiangli520210/ionic,ralic/ionic,taraszerebecki/ionic,Sourazou/login,promactkaran/ionic,Tetpay/ionic,ddddm/ionic,jomaf1010/ionic,chinakids/ionic,promactkaran/ionic,jianganglu/ionic,emonidi/ionic,cnbin/ionic,uidoyen/ionic,Jeremy017/ionic,staney7/ionic