Have you checked out what that command does when you run it from the
command line?  Does it complete successfully?  What is the return
code?

Possibility 1: Your version of Puppet (you didn't say which) is not
correctly preserving the inner single quotation marks around '$name
*|'.  This seems unlikely, but I'm having trouble seeing why else the
command would actually fail, as opposed to returning *some* result,
even if it were the wrong one.  Michael's suggestion of changing the
output format might provide a workaround in that case.  Alternatively,
if you're not on the latest Puppet then you could try upgrading.

Possibility 2: (?) The fact that the command runs without error when
you remove the (pipe) rules out pretty much everything else I came up
with.

Do note, by the way, that the 'unless' command is buggy in any event,
because it will return the wrong result when there is an existing
database with a name suffix that matches your database's name.
Depending on the psql output details, there may be other possibilities
for unintended matches.  That in itself would be an excellent reason
to look into taking tighter control of the psql output format, or else
inserting an additional filter between psql and grep (which could be
another grep).  If your database name contains regex metacharacters
(e.g. '.'), then that also would present a possibility of unintended
matches.

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