Update tools/juju-bundle-applications.py

thanks for catching that

Co-authored-by: Nicolas Bock <[email protected]>

tools/juju-bundle-applications.py

@@ -8,7 +8,7 @@
 for filename in sys.argv[1:]:
     with open(filename, 'r') as f:
         data = yaml.load_all(f, Loader=yaml.SafeLoader)
-        if 'applications' in data:
-            application_list.update(data['applications'].keys())
-
+        for d in data:
+            if 'applications' in d:
+                application_list.update(d['applications'].keys())
 print('\n'.join(application_list))