fix CSW 3 GetRecords parameter handling (#543) (#544)

[tomkralidis]

Overview

Fixes CSW 3.0.0 GetRecords parameter handling.

Related Issue / Discussion

#543 #544

Additional Information

Contributions and Licensing

(as per https://github.com/geopython/pycsw/blob/master/CONTRIBUTING.rst#contributions-and-licensing)

• I'd like to contribute [feature X|bugfix Y|docs|something else] to pycsw. I confirm that my contributions to pycsw will be compatible with the pycsw license guidelines at the time of contribution.
• I have already previously agreed to the pycsw Contributions and Licensing Guidelines

[codecov]

Codecov Report

Merging #545 into master will decrease coverage by 0.09%.
The diff coverage is 33.33%.

@@            Coverage Diff            @@
##           master     #545     +/-   ##
=========================================
- Coverage   55.98%   55.89%   -0.1%     
=========================================
  Files          29       29             
  Lines        6346     6346             
  Branches     1345     1345             
=========================================
- Hits         3553     3547      -6     
- Misses       2413     2417      +4     
- Partials      380      382      +2

Flag	Coverage Δ
#integrationtests	54.53% <33.33%> (-0.1%)	⬇️
#unittests	7.62% <0%> (ø)	⬆️

Impacted Files	Coverage Δ
pycsw/core/config.py	82.85% <ø> (ø)	⬆️
pycsw/server.py	64.35% <0%> (-1.23%)	⬇️
pycsw/ogc/csw/csw3.py	47.58% <50%> (ø)	⬆️
pycsw/ogc/fes/fes2.py	39.13% <0%> (ø)	⬆️

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