Bug in inspector when using assert and groovy?

Hello all,

When I use assert in groovy code I'm getting an inspection warning: "Not all execution paths return a value". For example this method:

    private String fileMimeType(File file) {
        assert (file != null)
      
        Magic parser = new Magic() ; // JMimeMagic
        MagicMatch match = parser.getMagicMatch(file, true);
        return match.getMimeType()
    } // this point gets highlighted with the inspection warning

If I comment the assert line the warning disappear.

Is this the correct behavior? I don't think it's missing any return.

Regards,
Felipe Cypriano