[rfc][icedtea-web][policyeditor] Fix for NPE when trying to open a file

[Andrew Azores]

Hi,

This workflow:
1) Open PolicyEditor with no filepath
2) Make changes
3) File>Open, without saving first
4) Select "Yes" to save changes

Currently results in:
5) NPE

due to the file field still being null. With this patch, it is the 
following:
5) File chooser appears for Save As action
6) Save file somewhere, or cancel
7) If file chooser was not cancelled, a new file chooser appears for the 
Open action. If it was cancelled, return back to the editor, with 
changes preserved but not saved to file

Thanks,

-- 
Andrew A

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