Utoipa path derive has conflict with axum-valid Valid for form

[1g0rkR]

Hi there,

I am using both utoipa derive path and axum_valid::Valid for form. They both cannot work together.
```proc-macro panicked: called Option::unwrap() on a `None` valuerust-analyzermacro-error
custom attribute panicked
message: called `Option::unwrap()` on a `None` valuerustcClick for full compiler diagnostic
utoipa_gen
proc_macro path

I would appreciate any support on it.

[juhaku]

@1g0rkR There is now at master a change #977 that might fix this issue as well. The PR fixes a similar issue #976.