Update yaml_filter.py (#365) (#367)

(cherry picked from commit ce41dcb)

Co-authored-by: Pablo Garrido <[email protected]>

Author: mergify[bot]

scripts/yaml_filter.py

@@ -11,9 +11,10 @@
     repos_keep = yaml.safe_load(open(sys.argv[1]))['keep'].split()
 
     target = {'repositories': {}}
+    
+    if repos_info:
+        for key in repos_info["repositories"]:
+            if key in repos_keep:
+                target['repositories'][key] = repos_info["repositories"][key]
 
-    for key in repos_info["repositories"]:
-        if key in repos_keep:
-            target['repositories'][key] = repos_info["repositories"][key]
-
-    print(yaml.dump(target))
+    print(yaml.dump(target))