Fix mailing note

[talavis]

Should fix the logic for notification about an email being sent.

Not tested in CLI.

Closes #957.

• Tests passing
• Black formatting
• [-] Migrations for any changes to the database schema
• Rebase/merge the dev branch
• Note in the CHANGELOG

[codecov]

Codecov Report

Merging #963 (5de9a5c) into dev (938751b) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head 5de9a5c differs from pull request most recent head d66fe74. Consider uploading reports for the commit d66fe74 to get more accurate results

@@            Coverage Diff             @@
##              dev     #963      +/-   ##
==========================================
- Coverage   87.92%   87.91%   -0.02%     
==========================================
  Files          26       26              
  Lines        2899     2895       -4     
==========================================
- Hits         2549     2545       -4     
  Misses        350      350              

Impacted Files	Coverage Δ
dds_web/api/user.py	87.56% <100.00%> (+0.03%)	⬆️
dds_web/api/dds_decorators.py	83.52% <0.00%> (-0.92%)	⬇️

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[i-oden]

Yes, this fixed it!