Improve error message if update cache interrupted during download (#6740)
Improve error message if update cache interrupted during download (#6740)


cbracken/flutter,cbracken/flutter,tvolkert/flutter,flutter/flutter,turnidge/flutter,tvolkert/flutter,Hixie/flutter,tvolkert/flutter,flutter/flutter,Hixie/flutter,turnidge/flutter,flutter/flutter,flutter/flutter,flutter/flutter,flutter/flutter,Hixie/flutter,tvolkert/flutter,tvolkert/flutter,turnidge/flutter,cbracken/flutter,cbracken/flutter,flutter/flutter,Hixie/flutter,tvolkert/flutter,flutter/flutter,tvolkert/flutter,Hixie/flutter,cbracken/flutter,Hixie/flutter,cbracken/flutter,turnidge/flutter,flutter/flutter,cbracken/flutter,tvolkert/flutter,cbracken/flutter,flutter/flutter,Hixie/flutter,tvolkert/flutter,Hixie/flutter,Hixie/flutter,cbracken/flutter,cbracken/flutter,Hixie/flutter,turnidge/flutter,tvolkert/flutter