fix the release validation issue

src/main/python/ddadevops/domain/release.py

@@ -46,7 +46,7 @@ class Release(Validateable):
                 )
         if self.version:
             result += self.version.validate()
-        if self.release_type is not None:
+        if self.release_type is not None and self.release_type != ReleaseType.NONE:
             result += self.__validate_is_not_empty__("release_current_branch")
             if (
                 self.release_current_branch is not None