fixed 2MASS plotting problems due to NaNs

[djones1040]

Fixes # .

Description of the Change

2MASS plotting fixed. Docs build fixed w/ readthedocs config update.

Checklist

Please check all that apply to your proposed changes

• [ ] HTML code change
• [ ] Added package dependency
• [ ] Added data
• [ ] Changed django model
• [ ] Documentation change
• [ ] Added or changed TaskRunner

Additional context

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (706e8f2) 70.93% compared to head (6f95e96) 70.93%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #177 +/- ## ======================================= Coverage 70.93% 70.93% ======================================= Files 24 24 Lines 1868 1868 ======================================= Hits 1325 1325 Misses 543 543 ``` | [Impacted Files](https://codecov.io/gh/astrophpeter/blast/pull/177?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Peter) | Coverage Δ | | |---|---|---| | [app/host/plotting\_utils.py](https://codecov.io/gh/astrophpeter/blast/pull/177?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Peter#diff-YXBwL2hvc3QvcGxvdHRpbmdfdXRpbHMucHk=) | `61.74% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Peter). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Peter)

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[astrophpeter]

Nice