Avoid ArrayOutOfBoundsException when Open Recent menu is empty
Avoid ArrayOutOfBoundsException when Open Recent menu is empty

Reported by Robert Baer in http://fiji.sc/bugzilla/show_bug.cgi?id=762.

Signed-off-by: Johannes Schindelin <53fb8db7833fca1e1746dd8592f61048d350f64c@gmx.de>

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