#214178: CSL navigator does not refresh

Bug description: http://netbeans.org/bugzilla/show_bug.cgi?id=214178

The Navigator does not refresh when the file content is updated. The 
update tries to exclude such children, which were never initialized. At 
the same time, the update must not exclude nodes, which are being 
initialized even for the first time, and during asynchronous init, the 
update request comes.

I forgot to cover the case when the nodes are initialized immediately, 
leaving 'processing' token at 0 (initialized == true && processing == 0).

Impact assesment: The navigator is unusable for PHP, JS, CSS

Risk assesment: the fix allows more nodes to be processed, does not 
change the the update procedure itself. If the condition is (still) 
broken, we face "just" performance decrease to the level of NB 7.1, 
which updated the whole node tree

Reviewed by: Petr Pisl ([email protected])

Changeset: http://hg.netbeans.org/jet-main/rev/88568e34c779

Thanks for review.
-Svata