#190041: IllegalStateException: The model is not initialized or is broken.

http://netbeans.org/bugzilla/show_bug.cgi?id=190041
http://hg.netbeans.org/core-main/rev/a39b2899f195 revised to http://hg.netbeans.org/core-main/rev/4017ce92980a

Impact: exception thrown frequently when editing pom.xml files while the Navigator window is open.

Risk: exact nature of bug not fully understand even by XAM/XDM developers. Current fix is just to suppress the exception; Navigator will show empty content for the POM 
after the problem occurs, though this sometimes corrects itself after further edits. At any rate, occasionally showing a blank "POM Model" view is less bothersome than 
the original exception.