[storage2urimapper] catch RuntimeExceptions and log locally (see https://bugs.eclipse.org/bugs/show_bug.cgi?id=452808)
[findbugs] Fixed a minor issues

Change-Id: I5b7be71d6f66eaf40ebe460f0da75fb853833405
Signed-off-by: Dennis Huebner <dennis.huebner@itemis.de>