I am adding a new tool to our in-house Galaxy, which has a few string inputs. I 
have made each one a text param in the XML, but want to ensure that the user 
does not leave any empty when he executes the tool.

How can I do this? I tried setting the optional field of each text param to 
false, but that doesn't work since, technically, an empty string still counts 
as a string.

Is there a minimum length setting I can enforce?

Ravi Sanka
ICS – Sr. Bioinformatics Engineer
J. Craig Venter Institute
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