fix(parser): return error for unknown parser type

Previously, if the parser type did not match any valid types, Parse
would silently do nothing and return nil as if it succeeded. This
made it easy to miss typos or invalid parser types.

Now, an unknown parser type will return an error, making it easier
to catch mistakes.

Author: jessefaler

parser/parser.go

@@ -215,7 +215,10 @@ func (f *ConfigurationFile) Parse(file ufs.File) error {
 		err = f.parseIniFile(file)
 	case Xml:
 		err = f.parseXmlFile(file)
+	default:
+		return errors.Errorf("parser: unknown parser type %q", f.Parser)
 	}
+
 	return err
 }