I have a script that allows arbitrary filtering on a resource within a more complicated step.
in the command section, I have:
 #if $filter_fxn1 != ""
  --filter_fxn1="$filter_fxn1"
 #end if

and

<param name='filter_fxn1' type='text' label='Filter expression for resource1' />
in the inputs section.  The trouble is that when there is no text in the input text box, I'm still getting --filter_fxn1="" in my parameter string.

galaxy.jobs.runners.local DEBUG 2010-08-02 16:06:33,027 execution finished: python /home/wbiesing/galaxy_dist/tools/chipSeq/python/enrichment_pairwise.py --quiet --filter_fxn1=""

PS-- for simple questions like this on developing tools, should I be deferring to the galaxy-users list?

Thanks!
--
Jake Biesinger
Graduate Student
Xie Lab, UC Irvine
(949) 231-7587