Check for transport output before loading input files

[cbegeman]

Check for transport output before loading input files

[cbegeman]

In testing E3SM-Project/zppy#760, we find that one additional change is needed to ensure transport time series can be generated from the cache.

[xylar]

The Python 3.14 fail is expected, see #1127 (comment). Since I expect a fix in not too long, we could just disable python 3.14 in CI now and re-enable it in #1127. But I would prefer not to bother.

[xylar]

I changed my mind. I'll drop it for now in #1129

[xylar]

Testing

I ran the dev suite with thing branch and things work fine (the no_ncclimo and main_vs_ctrl tests are still running but no sign of trouble).

https://web.lcrc.anl.gov/public/e3sm/diagnostic_output/xasaydavis/analysis_testing/chrysalis/do-not-require-tseries-transport-files-if-cached-output/

[xylar]

I realize I should have approved this formally. The changes are simple and make sense.

[cbegeman]

@xylar Thank you for reviewing!