Handle missing attribute in mpcdf_enabled_repositories

mpcdf_enable_repositories.py

@@ -100,4 +100,10 @@ def do_mpcdf_enable_repositories(self, subcmd, opts, *args):
     if opts.reset or opts.set:
         mpcdf_common.mpcdf_enable_repositories(api_url, project, package, verbose=True)
     else:
-        print("Enabled for:", *mpcdf_common.get_attribute_values(api_url, project, package, "MPCDF:enable_repositories"))
+        try:
+            repos = mpcdf_common.get_attribute_values(api_url, project, package, "MPCDF:enable_repositories")
+        except Exception:
+            repos = ()
+            print("ERRROR: No attribute MPCDF:enable_repositories present, package unmanaged")
+        if repos:
+            print("Enabled for:", *repos)