add_api_operation refactor

[shimakaze-git]

Hello,

I've refactored the conditional logic in the add_api_operation method of the Router class for improved readability. The new approach uses the dictionary's get method, which simplifies the code.

Here's the updated code snippet:

path_view: Optional[PathView] = self.path_operations.get(path)
if not path_view:
    path_view = PathView()
    self.path_operations[path] = path_view

Thank you for considering this change.