Resolve flake8 errors

[argaudreau]

Description

Flake8 tests were failing for all new builds, so this resolves them so new PRs can be merged.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Flake8 tests pass locally.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Merging #2376 (7196156) into master (9b43a7f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2376   +/-   ##
=======================================
  Coverage   72.59%   72.59%           
=======================================
  Files         110      110           
  Lines        7947     7947           
=======================================
  Hits         5769     5769           
  Misses       2178     2178           

Impacted Files	Coverage Δ
app/api/packs/advanced.py	75.00% <ø> (ø)
app/api/packs/campaign.py	30.61% <ø> (ø)
app/api/rest_api.py	59.29% <ø> (ø)
app/api/v2/handlers/base_object_api.py	86.00% <ø> (ø)
app/api/v2/handlers/operation_api.py	98.70% <ø> (ø)
app/api/v2/managers/ability_api_manager.py	90.00% <ø> (ø)
app/api/v2/managers/base_api_manager.py	96.46% <ø> (ø)
app/api/v2/managers/operation_api_manager.py	89.00% <ø> (ø)
app/contacts/contact_gist.py	50.76% <ø> (ø)
app/contacts/contact_html.py	59.09% <ø> (ø)
... and 16 more

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