Error handling for c-bindings interfaces are broken on `dev-cbind`

[andrew-platt]

Bug description
The MD c-binding (py_MD_OC4Semi) is not properly passing errors back out through the interface

Noticed while making #2719
possibly related to changes in #2680

See comment
OpenFAST/r-test#148 (comment)

[andrew-platt]

Not an issue. See OpenFAST/r-test#148 (comment)