Merge bitcoin/bitcoin#25367: [contrib] message-capture-parser: fix out of bounds error for empty vectors

42bbbba7c83d1e2baad18b4c6f05bad1358eb117 message-capture-parser: fix out of bounds error for empty vectors (Sebastian Falbesoner)

Pull request description:

  The script [message-capture-parser.py](https://github.com/bitcoin/bitcoin/blob/master/contrib/message-capture/message-capture-parser.py) currently throws an "out of bounds" error if a message containing an empty integer vector element is tried to converted to JSON (e.g. by the BIP157 message `cfcheckpt` with empty `FilterHeaders` vector):
  ```
  Traceback (most recent call last):
    File "/home/honey/bitcoin/./contrib/message-capture/message-capture-parser.py", line 217, in <module>
      main()
    File "/home/honey/bitcoin/./contrib/message-capture/message-capture-parser.py", line 202, in main
      process_file(str(capture), messages, "recv" in capture.stem, progress_bar)
    File "/home/honey/bitcoin/./contrib/message-capture/message-capture-parser.py", line 162, in process_file
      msg_dict["body"] = to_jsonable(msg)
    File "/home/honey/bitcoin/./contrib/message-capture/message-capture-parser.py", line 85, in to_jsonable
      elif slot in HASH_INT_VECTORS and isinstance(val[0], int):
  IndexError: list index out of range
  ```

  Fix this by using the `all(...)` predicate rather to access the first element `val[0]` (which in the error case doesn't exist).

ACKs for top commit:
  laanwj:
    Code review ACK 42bbbba7c83d1e2baad18b4c6f05bad1358eb117

Tree-SHA512: 139ec6b90304a69f26ec731e6f12b216fa10e554f777505b61adfa1e569f6861a4a849159dd1eae7a1aa0427e8598af226b6f0c4015020dcac8ab109fbc35dba

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