[Issue 6375] New - NullPointerException saving

http://argouml.tigris.org/issues/show_bug.cgi?id=6375
                 Issue #|6375
                 Summary|NullPointerException saving
               Component|argouml
                 Version|0.33.2
                Platform|Macintosh
                     URL|
              OS/Version|All
                  Status|NEW
       Status whiteboard|
                Keywords|
              Resolution|
              Issue type|DEFECT
                Priority|P3
            Subcomponent|Collaboration Diagram
             Assigned to|bobtarling
             Reported by|jrepenning_cn






------- Additional comments from [email protected] Wed Sep 14 15:16:39 -0700 2011 -------
Can't save  model:

java.lang.NullPointerException
at org.argouml.ui.ProjectBrowser.trySave(ProjectBrowser.java:1398)
at org.argouml.ui.SaveSwingWorker.construct(SaveSwingWorker.java:115)
at org.argouml.ui.SwingWorker.doConstruct(SwingWorker.java:153)
at org.argouml.ui.SwingWorker$2.run(SwingWorker.java:281)
at java.lang.Thread.run(Thread.java:680)

This happens intermittently: sometimes I get it, make some changes to the model, and then it can save. I 
will attach a .zargo file in a state where I find this to be reproducible:

1. double-click Sso.zargo
2. cmd-s
==> NPE

The .zargo was originally created using ArgoUML 0.32. When I started hitting this problem, I upgraded to 
0.32.2. I can't say this has made an particular difference.

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