https://bz.apache.org/bugzilla/show_bug.cgi?id=58293

--- Comment #2 from Sebb <[email protected]> ---
I think I've found the problem. 

The ctor FilePanelEntry(String label, ChangeListener listener, String... exts)
was converted to use String ... rather than String[] a long while back.
When it is called with a null String as the final parameter, that is converted
into an array with a single null entry.

Not sure why the compiler does not warn about this.

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