HR fix 151364 Weird error when compiling

Thomas Preisler <[email protected]>
Newsgroups gmane.comp.java.netbeans.reviewers
Message-ID <[email protected]>
Description of the bug:
151364 Weird error when compiling
http://www.netbeans.org/issues/show_bug.cgi?id=151364
Open Add Preprocessor Definition dialog to enter a macro definition and 
  click either 1) Cancel or 2) OK without typing something in the text 
field will cause uncompilable code (empty -D option) to be generated. 
The project will not build. 1) is a common scenario.

Impact assessment:
If the user opens the Add Preprocessor Definition dialog and jut clicks 
Cancel, incorrect makefile will get generated and his project is 
uncompilable. It is not an uncommon scenario and it is not obvious to 
understand what happened and how to correct the error.

Risk assessment i.e. why is it safe?:
Checking for empty string and checking for null. Simple, isolated, and 
low-risk changes.

Confirmation of peer code review and QE verification of fix:
Code change reviewd and approved by Gordon Prieur. See bug report.
Fix validated by Alexander Pepin (QA). See bug report.

Changeset info (for reviewing diffs):
Changeset: http://hg.netbeans.org/main/rev/9f4c9b164136
User: Thomas Preisler <[email protected]>
Log: #151364 Weird error when compiling
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