Fix Rootmodel template with reuse-model

[atti92]

We get an error on the black formatter when using --reuse-model, because it tries to save inherited RootModels with an empty []

class Limits(Requests[])):
    pass

The change removes the empty brackets []

[codspeed-hq]

CodSpeed Performance Report

Merging #1902 will not alter performance

_{Comparing atti92:atti92-patch-1 (eb833ab) with main (04f8e77)}

Summary

✅ 29 untouched benchmarks

[atti92]

@koxudaxi PR failed with codecov upload:

Error: Codecov: Failed to properly upload: The process '/home/runner/work/_actions/codecov/codecov-action/v3/dist/codecov' failed with exit code 255```

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@f8c4506). Click here to learn what that means.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1902   +/-   ##
=======================================
  Coverage        ?   98.89%           
=======================================
  Files           ?       37           
  Lines           ?     4171           
  Branches        ?      971           
=======================================
  Hits            ?     4125           
  Misses          ?       29           
  Partials        ?       17           

Flag	Coverage Δ
unittests	98.56% <ø> (?)

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