False positive TRY300 when there is no except clause

[Czaki]

In napari we have such a function https://github.com/napari/napari/blob/ab885957fb5a2220a3078851ad7dc97a7a82cc05/napari/utils/misc.py#L253

def formatdoc(obj):
    """Substitute globals and locals into an object's docstring."""
    frame = inspect.currentframe().f_back
    try:
        obj.__doc__ = obj.__doc__.format(
            **{**frame.f_globals, **frame.f_locals}
        )
        return obj
    finally:
        del frame

The TRY300 is reported on return obj. But the else clause is available only when the except clause is present (there needs to be at least one). So TRY300 should not be reported if there is no except clause. Or it should have different text describing that.

Currently:

TRY300 Consider moving this statement to an `else` block

Possible:

TRY300 Consider moving this statement after `try: finally:`

[JonathanPlasse]

I would like to work on it.