Add else statement in all try/except block where try was with return … #204
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According to the documentation: http://docs.python.org/reference/compound_stmts.html#the-try-statement
A try/except block should not have a return in the try block.
This provoked some invisible bugs.
I added an else statement, which returns the value found in the try statement.
Note that a return in the except statement is perfectly correct.