fix(cloudtrail): check if trails exist in service

[MrCloudSec]

Description

To avoid accessing an empty dictionary and getting the following error, check if the trails exist first:

2024-06-03 16:31:23,383 [File: cloudtrail_service.py:90] [Module: cloudtrail_service] ERROR: us-east-1 -- AttributeError[40]: 'NoneType' object has no attribute 'keys'

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.64%. Comparing base (0c01cf2) to head (0976e7d).
Report is 422 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4161      +/-   ##
==========================================
- Coverage   86.67%   86.64%   -0.04%     
==========================================
  Files         817      817              
  Lines       25578    25578              
==========================================
- Hits        22169    22161       -8     
- Misses       3409     3417       +8     

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