This is, what it is intended to do. It returns None, if it reaches the end of 
the function w/o passing a return statement. We need this case, as there are 
several calls, where the return value is tested to be None. This is for example 
the case each time I added True to existing calls.
-- 
https://code.launchpad.net/~m2j/openlp/work/+merge/82668
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