Scan for presence of a header in Grouping1 to improve the UX

[hechth]

https://github.com/galaxyproject/galaxy/blob/9fc0f0593517612f14c612c1648c2dc1a040f545/tools/stats/grouping.xml#L20C1-L20C91

[ElectronicBlueberry]

Please add a few additional details to the issue description. Details which could help us address issues include:

• What part of galaxy you are referring to. Client, Tool development, etc.
• Description of what is currently happening, and what you would like / expect to happen instead
• A screenshot or two
• An example use case

[hechth]

Hi Laila, sorry, this was more a brief reminder to myself :) This is regarding one of the "built in" Galaxy tools which is part of the core codebase. I'm sure this is very easy to fix and it becomes immediately visible when using the tool.

see the attached screnshot - the column names are not used (and can't be).