Remove new internal field.

pdcupdater/handlers/compose.py

@@ -136,6 +136,11 @@ def _import_compose(self, pdc, compose_id, compose_url):
             composeinfo['payload']['release']['short'].lower()
         release = copy.copy(composeinfo['payload']['release'])
         release['release_type'] = release.pop('type', 'ga')
+
+        # PDC doesn't know about this field which showed up recently in pungi
+        # productmd metadata here.
+        release.pop('internal')
+
         release_id = "{short}-{version}".format(**release)
         pdcupdater.utils.ensure_release_exists(pdc, release_id, release)