Please revie the fix for #194294 - Code Completion broken in 7.0

Issue: http://netbeans.org/bugzilla/show_bug.cgi?id=194294
Change: http://hg.netbeans.org/main/rev/c0b15d6791dc

In the index there were not stored return types of methods that don't 
have return type defined in PHP Doc.  The features like code completion 
and navigation didn't work in a method chain call, where was a method 
without PHP Doc.

This fix adds the return types to the index except when the file is 
edited due to the performance reasons. Counting return type from method 
body can take long time.

Risk: There is no known risk.