Puppet users - Jan 2014 - Alternating results with mount Puppet resource

Hi,
I have a problem with a host which has a Puppet class applied to it.
The host, a CentOS 6.4 machine, has been provisioned and is managed using 
Foreman, but I'm not sure this is related to the problem.

The class includes a "mount" type resource which should mount a NFS
share
and add the related line in /etc/fstab.
But the existing fstab file on that machine has an error: there is one 
custom line starting with a space (although I cannot find any official doc 
stating that this is actually forbidden), and this causes the manual 
application of the puppet class (puppet agent --test) to *always* fail with 
the message "Could not evaluate: Field 'device' is required".

Up to here, this is ok. The failure is expected behaviour, if the leading 
space in fstab really is a syntax error.
I've read elsewhere that this error does not come from puppet itself, but 
rather from the OS when puppet tries to "flush" the fstab file.

The problem is with automated puppet runs every 30 minutes, as per default: 
50% of the runs end with no errors in the report, even though the class is 
not correctly applied.
One report shows the error, the next one does not, the next shows it again, 
then again not, and so on.
This can be very misleading, as you could believe everything is ok by 
looking at the error-free logs.

Any suggestions?

Thanks.
Marco

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