Reverse an earlier over-zealous check for a non-null value of the retriever.  This prevented lots and lots of feed items coming through.

Conflicts:
	retriever/retriever.php
Clarify the language of the help text a little
Merge remote-tracking branch 'upstream/master' into retriever

Conflicts:
	retriever/view/help.tpl
Merge pull request #119 from mexon/retriever

Reverse an earlier over-zealous check for a non-null value of the retrie...