Review: Needs Fixing

Depending on what you're wanting to achieve, you need to either use "if key is 
not None and ..." or "if key and ...". The first one will check if the 
variable's value is None, and the second one will check if the variables value 
is not None, False, 0 or an empty string.
-- 
https://code.launchpad.net/~mahfiaz/openlp/unicode_warning_fix/+merge/84681
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