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Created attachment 3781 [details]
Fixes unjustified generator=watchlist gwlprop error

http://www.mediawiki.org/w/api.php?action=query&prop=info&generator=watchlist

gives:

<error code="gwlparams" info="gwlprop parameter may not be used in a generator">

while gwlprop wasn't set. This is because the code assumes the default for gwlprop (ids|title|flags), and then complains that it's not empty. Setting gwlprop to an empty value doesn't work either, so there is currently no way to use list=watchlist as a generator.

The attached patch fixes this by only throwing an error if gwlprop is not set to its default value. The downside of this is that

api.php?action=query&prop=info&generator=watchlist&gwlprop=ids|title|flags

won't cause an error, but it won't affect the query result either.