Fix "page goes blank after saving" bug
Fix "page goes blank after saving" bug

This was breaking if your internet was fast. ;)
Fade-out of the web view to the progress indicator was getting
canceled by the subsequent fade-in, but the listener's onAnimationEnd
handler was still being called and hiding the webView completely.

Added a check for cancelation, which seems to resolve it.

Bug: 60696
Change-Id: I226568aa43fd5720af34ce285d6136b702b881c5

carloshwa/apps-android-wikipedia,wikimedia/apps-android-wikipedia,dbrant/apps-android-wikipedia,parvez3019/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,parvez3019/apps-android-wikipedia,Duct-and-rice/KrswtkhrWiki4Android,Wikinaut/wikipedia-app,anirudh24seven/apps-android-wikipedia,parvez3019/apps-android-wikipedia,Duct-and-rice/KrswtkhrWiki4Android,reproio/apps-android-wikipedia,reproio/apps-android-wikipedia,reproio/apps-android-wikipedia,reproio/apps-android-wikipedia,Wikinaut/wikipedia-app,carloshwa/apps-android-wikipedia,parvez3019/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,Wikinaut/wikipedia-app,carloshwa/apps-android-wikipedia,BrunoMRodrigues/apps-android-tbrc-work,Duct-and-rice/KrswtkhrWiki4Android,Wikinaut/wikipedia-app,SAGROUP2/apps-android-wikipedia,reproio/apps-android-wikipedia,creaITve/apps-android-tbrc-works,creaITve/apps-android-tbrc-works,SAGROUP2/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,BrunoMRodrigues/apps-android-tbrc-work,parvez3019/apps-android-wikipedia,dbrant/apps-android-wikipedia,Duct-and-rice/KrswtkhrWiki4Android,creaITve/apps-android-tbrc-works,dbrant/apps-android-wikipedia,wikimedia/apps-android-wikipedia,carloshwa/apps-android-wikipedia,wikimedia/apps-android-wikipedia,BrunoMRodrigues/apps-android-tbrc-work,creaITve/apps-android-tbrc-works,Wikinaut/wikipedia-app,anirudh24seven/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,wikimedia/apps-android-wikipedia,carloshwa/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,dbrant/apps-android-wikipedia,BrunoMRodrigues/apps-android-tbrc-work,dbrant/apps-android-wikipedia,Duct-and-rice/KrswtkhrWiki4Android