#177690: Unable to change server for RoR in default configuration

Please review the fix for 
https://netbeans.org/bugzilla/show_bug.cgi?id=177690

Description: Changing the server in project properties has no effect in 
the default configuration.

Problem: An erroneous check for null config in the customizer - there 
was a check that prevented storing the changes if the value was null, 
which is incorrect as a null value for config represents the default config.

Fix: Remove the check. The fix is trivial and safe.

Verified in trunk by Tomas Musil.

Thanks
Erno