Metop-C compatibility

[carloshorn]

The current version cannot process Metop-C files.
I have a hot fix, but maybe let us discuss the options.

The problem is that there is no entry in the dictionary metadata.TIME_COVERAGE and therefore the program raises a KeyError.
Adding the Metop-C data would fix this issue, but I would suggest to change the following lines:

pygac-fdr/pygac_fdr/writer.py

Lines 351 to 353 in a270843

	time_cov_start, time_cov_end = TIME_COVERAGE[
	get_gcmd_platform_name(ch4.attrs["platform_name"], with_category=False)
	]

in favour of using TIME_COVERAGE.get(..., (None, None)), and add the time_cov_start metadata optionally (same as time_cov_end). The missing time_cov_start should raise a warning, but it should not be the show stopper.

What do you think?

[sfinkens]

@carloshorn I agree, nice solution! Are you already working on it or shall I?

[carloshorn]

@sfinkens, I can setup the PR.

[sfinkens]

Closing, as MetOp-C has been added by #84. Opened a new issue for the attribute issue (#90).