#177667: Code completion adds block with param

Please review the fix for 
https://netbeans.org/bugzilla/show_bug.cgi?id=177667

Description: Invoking CC for certain methods adds an unwanted block

Cause: The code for analyzing RDoc to determine whether or not a method 
needs a block was looking at the RDoc of the whole class instead of the 
method in question and hence produced erroneous results.

Fix: Changed the code to look at the the rdoc of the method. A trivial 
and safe change.

Verified in trunk by Tomas Musil.

Thanks
Erno