fix: Avoid exception when input is missing for diff and deploy

mastodon_blocklist_deploy/cli.py

@@ -96,7 +96,11 @@ def cli():
             blocklist_filename = args.input_file
         else:
             blocklist_filename = "../blocklist.toml"
+        try:
             local_blocklist = load_blocklist_file(blocklist_filename)
+        except FileNotFoundError:
+            print("Local blocklist file was not found. Make sure to specify it's location via -i")
+            exit()
 
     if args.action == "diff":
         Instance.show_diffs(local_blocklist, remote_blocklist)