[PUI] fix infinite loop if classic frontend is disabled

[matmair]

Fixes #8575

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[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 84.60%. Comparing base (8ac8527) to head (01abf4f).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
src/backend/InvenTree/plugin/plugin.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8614   +/-   ##
=======================================
  Coverage   84.60%   84.60%           
=======================================
  Files        1188     1188           
  Lines       54270    54269    -1     
  Branches     2050     2050           
=======================================
  Hits        45915    45915           
+ Misses       7848     7847    -1     
  Partials      507      507           

Flag	Coverage Δ
backend	86.05% <33.33%> (+<0.01%)	⬆️

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[matmair]

@SchrodingersGat this seems to work; But could you verify before merge? This seems to easy

[SchrodingersGat]

@matmair yup, seems to have fixed the issue, nice work :)