Org: Make newsletters subscripers import more robust.

[cyrillkuettel]

TYPE: Bugfix LINK: OGC-1829

Checklist

• [x] I have performed a self-review of my code

[linear[bot]]

OGC-1829 E-Mail Adressen aus Newsletter verschwunden

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 52.00000% with 12 lines in your changes missing coverage. Please review.

Project coverage is 89.47%. Comparing base (6f9d132) to head (a39fdeb). Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
src/onegov/org/forms/newsletter.py	43.75%	9 Missing :warning:
src/onegov/core/cli/commands.py	0.00%	2 Missing :warning:
src/onegov/org/views/subscription.py	75.00%	1 Missing :warning:

Additional details and impacted files

Files with missing lines	Coverage Δ
src/onegov/core/cache.py	95.45% <ø> (ø)
src/onegov/org/models/ticket.py	88.64% <100.00%> (ø)
src/onegov/org/views/newsletter.py	96.71% <100.00%> (ø)
src/onegov/org/views/subscription.py	89.28% <75.00%> (-3.03%)	:arrow_down:
src/onegov/core/cli/commands.py	40.50% <0.00%> (ø)
src/onegov/org/forms/newsletter.py	86.28% <43.75%> (-0.70%)	:arrow_down:

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