Follow-up Comment #3, bug #17495 (project freeciv):

> else part should be removed too 

The else part does set the variable to 'no'. The following test do onyl check
if the variable is set to 'yes'. Thus, you get the same result if it exists
(='no') or if it is not defined. I think that setting it to 'no' (no
mysql/postgres) helps the reader to understand the code.

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