Skip Spitzer section if no images found

[jacquesalice]

Relates to DLC-2117. Fixed error by adding a conditional statement if Spitzer images were found. @rnikutta can you please review and Approve?

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[rnikutta]

Hi @jacquesalice I took a look. Your PR seems to be a work-around, but the error lies really

a) in the fact that the currently installed versions of datalab, pyvo, and astroquery are mutually incompatible, and
b) that in newer versions of astroquery, there no longer is an sha (Spitzer Heritage Archive) module in the astroquery.ipac.irsa package. (I tried to find it elsewhere in astroquery v0.4.10, and in their release notes https://github.com/astropy/astroquery/releases but couldn't.

Digging more, it was actually flagged for removal: astropy/astroquery#2834
But I don't see that the ticket was closed.

The way to proceed is (if you can't find it where I failed):

1. Write to the astroquery maintainers (Brigitta S and Adam G), or open an issue on their Github:

https://pypi.org/project/astroquery/0.4.10/
https://github.com/astropy/astroquery/issues

2. Once we know the new suggested astroquery search for the SHA, we can proceed with updating the datalab package dependencies, and what's installed by default on our NB server.

PS: I made a new local Python env with conda, with Py3.12, pyvo 1.7, and astroquery 0.4.10, for testing purposes (no datalab package).

Until then, I suggest we close or pause this PR.