Org: Make newsletters subscripers import more robust.

[cyrillkuettel]

TYPE: Bugfix
LINK: OGC-1829

Checklist

• I have performed a self-review of my code

[linear]

OGC-1829 E-Mail Adressen aus Newsletter verschwunden

[codecov]

Codecov Report

Attention: Patch coverage is 54.54545% with 10 lines in your changes missing coverage. Please review.

Project coverage is 89.51%. Comparing base (4c8879f) to head (5d6ea55).

Files with missing lines	Patch %	Lines
src/onegov/org/forms/newsletter.py	43.75%	9 Missing ⚠️
src/onegov/org/views/subscription.py	75.00%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
src/onegov/org/views/newsletter.py	95.98% <100.00%> (-0.73%)	⬇️
src/onegov/org/views/subscription.py	89.28% <75.00%> (-3.03%)	⬇️
src/onegov/org/forms/newsletter.py	86.28% <43.75%> (-0.70%)	⬇️

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