do not silence exceptions on custom plugins (#487)

[tomkralidis]

Overview

Emits repository exceptions to server logs for debugging.

Related Issue / Discussion

#487

Additional Information

None

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 #527 into master will decrease coverage by 0.05%.
The diff coverage is 9.09%.

@@            Coverage Diff             @@
##           master     #527      +/-   ##
==========================================
- Coverage   56.04%   55.99%   -0.06%     
==========================================
  Files          29       29              
  Lines        6320     6326       +6     
  Branches     1338     1338              
==========================================
  Hits         3542     3542              
- Misses       2400     2407       +7     
+ Partials      378      377       -1

Flag	Coverage Δ
#integrationtests	54.64% <9.09%> (-0.06%)	⬇️
#unittests	7.6% <0%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
pycsw/server.py	65.41% <9.09%> (-0.83%)	⬇️
pycsw/ogc/fes/fes2.py	39.13% <0%> (ø)	⬆️

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