Only call refreshViews if the VM service is available (#5474)
Only call refreshViews if the VM service is available (#5474)

Fixes https://github.com/flutter/flutter/issues/5468
cbracken/flutter,tvolkert/flutter,Hixie/flutter,cbracken/flutter,Hixie/flutter,flutter/flutter,turnidge/flutter,cbracken/flutter,flutter/flutter,flutter/flutter,flutter/flutter,flutter/flutter,flutter/flutter,tvolkert/flutter,cbracken/flutter,tvolkert/flutter,flutter/flutter,cbracken/flutter,turnidge/flutter,cbracken/flutter,tvolkert/flutter,cbracken/flutter,cbracken/flutter,Hixie/flutter,Hixie/flutter,Hixie/flutter,tvolkert/flutter,Hixie/flutter,tvolkert/flutter,cbracken/flutter,Hixie/flutter,Hixie/flutter,tvolkert/flutter,Hixie/flutter,turnidge/flutter,flutter/flutter,tvolkert/flutter,turnidge/flutter,tvolkert/flutter,flutter/flutter,Hixie/flutter,flutter/flutter,turnidge/flutter,tvolkert/flutter,cbracken/flutter