fix: update get_ta_url to handle null branch

[joseph-sentry]

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Codecov Report

Attention: Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
services/urls.py	66.66%	1 Missing ⚠️

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[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.72%. Comparing base (dba53c5) to head (2765ece).
Report is 9 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
services/urls.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1181      +/-   ##
==========================================
- Coverage   97.72%   97.72%   -0.01%     
==========================================
  Files         453      455       +2     
  Lines       37117    37157      +40     
==========================================
+ Hits        36273    36311      +38     
- Misses        844      846       +2     

Flag	Coverage Δ
integration	42.80% <90.90%> (+0.01%)	⬆️
unit	90.55% <90.90%> (+<0.01%)	⬆️

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[Swatinem]

as you have access to Repository, please pick the main branch as it is stored in repo. (and also push that through quote_plus)