[JDEV] Patch for crash in mod_groups

[Nathan Sharp]

I found another crash in mod_groups in 1.4.2.  This was due to the code trying to free an xmlnode which had never been initialized.  It happens on the browse-set callback when the incoming packet does not have a proper <user> tag formed.  Here is a patch which fixes it.  This patch should be applied on top of the other patch I submitted here a few weeks ago. 

  Nathan


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