Catch new SNMP errors in juniper alarm task

[johannaengland]

Scope and purpose

Fixes #212.

This amends the changes made in #231 according to the new SNMP errors introduced/handled in #262.
This should finally lead to error being correctly handled and only things being logged if the device has an alarm count of an invalid type (but not none).

Contributor Checklist

• Added a changelog fragment for towncrier
• Linted/formatted the code with black, ruff and isort, easiest by using pre-commit
• The first line of the commit message continues the sentence "If applied, this commit will ...", starts with a capital letter, does not end with punctuation and is 50 characters or less long. See https://cbea.ms/git-commit/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.04%. Comparing base (5d77dc6) to head (a6f6a89).

❗ Current head a6f6a89 differs from pull request most recent head 5670e2b

Please upload reports for the commit 5670e2b to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #275      +/-   ##
==========================================
+ Coverage   98.88%   99.04%   +0.16%     
==========================================
  Files          51       50       -1     
  Lines        6876     6776     -100     
==========================================
- Hits         6799     6711      -88     
+ Misses         77       65      -12     

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[lunkwill42]

👍