Alow Blueprint routes to explicitly define error_format

[moshe742]

fix #2752

[ahopkins]

Thank you @moshe742!

Can you also add a test for this? In ./tests/test_errorpages.py there is this test:

def test_route_error_response_from_explicit_format(app):
    ...

You can copy the test and just attach the routes to a Blueprint object instead like in the issue.

[codecov]

Codecov Report

Patch coverage: 100.000% and project coverage change: +0.052 🎉

Comparison is base (e374409) 88.919% compared to head (f0b940c) 88.971%.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #2773       +/-   ##
=============================================
+ Coverage   88.919%   88.971%   +0.052%     
=============================================
  Files           92        92               
  Lines         6976      6991       +15     
  Branches      1190      1193        +3     
=============================================
+ Hits          6203      6220       +17     
+ Misses         529       527        -2     
  Partials       244       244               

Impacted Files	Coverage Δ
sanic/blueprints.py	91.743% <100.000%> (+0.038%)	⬆️

... and 8 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.

[ahopkins]

Thanks for the help on this.

[swheaton]

Thanks for fixing my reported issue! 🤩