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Created attachment 131686 [details] Picture is self explanatory try this javascript: a.b.c = { a: 'something', b: 'something-else' } In 7.3 Navigator window will show nothing and a title of "NULL"
The "null" issue is in CSL and is fixed as issue #223899. The navigator is also fixed and your case works correctly in dev build.
If you want to try a dev build, please download it from http://bits.netbeans.org/download/trunk/nightly/latest/ . Thanks
*** This bug has been marked as a duplicate of bug 223899 ***