write an empty file for filter blocks

bink.py

@@ -27,7 +27,8 @@ try:
     with open(filters_path, "r") as f:
         filters = json.load(f)
 except FileNotFoundError:
-    pass
+    with open(filters_path, "w") as f:
+        json.dump(filters, f)
 
 try:
     editor = os.environ["EDITOR"]