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Overview
previous fix unfortunately did not solve the issue,
the issue was not related to all-keywords being empty, but inside the keywords array, keyword.name being None.
this PR removes the None check for all-keywords, and adds None check for k.name
reproduce error by:
Related Issue / Discussion
#1019
Contributions and Licensing
(as per https://github.com/geopython/pycsw/blob/master/CONTRIBUTING.rst#contributions-and-licensing)