correctly detect when an embedding is incompatible with the current model

- Fixed the test for token length; tested on several .pt and .bin files
- Also added a __main__ entrypoint for CLI.py, to make pdb debugging a bit
  more convenient.

ldm/invoke/CLI.py

@@ -1387,3 +1387,7 @@ def check_internet() -> bool:
         return True
     except:
         return False
+
+if __name__ == '__main__':
+    main()
+