Fix "tests/test_create_climo_files.py::test_resolution_filter" test

[eyvorchuk]

This test passes but yields two warnings that say

/storage/home/eyvorchuk/climate-explorer-data-prep/dp/generate_climos.py:247: UserWarning: None of the selected output resolutions %s are computable from a file with %s temporal resolution .format(' ,'.join(output_resolutions), time_resolution)).

This occurs when resolutions is equal to set().

I am running Python 3.6.8 and the output is in the file below.
test_resolution_filter warning message.pdf