os.path.basename nan handling

[bnb32]

os.path.basename throws run ending error when file is missing (nan for file name)

nsrdb/nsrdb/data_model/clouds.py

Line 1439 in 19d8f7a

file_names = [os.path.basename(fp) for fp in file_names]

proposed solution:

nsrdb/nsrdb/data_model/clouds.py

Lines 1439 to 1440 in 5860c32

	file_names = [os.path.basename(fp) if isinstance(fp, str)
	else fp for fp in file_names]

[grantbuster]

I like it!