dig: EDNS options in requests cause bad YAML output

The YAML output for +qr with +nsid is bad. Note the "NSID" line below has no colon and no value, so the YAML output is invalid.

# /dig ns va  @c.root-servers.net -4 +notcp +yaml +qr +nsid +recurse +time=4 +tries=1
-
  type: MESSAGE
  message:
    type: RECURSIVE_QUERY
    query_time: !!timestamp 2019-09-13T16:34:17.956Z
    message_size: 47b
    socket_family: INET
    socket_protocol: UDP
    response_address: 192.33.4.12
    response_port: 53
    query_address: 0.0.0.0
    query_port: 62875
    query_message_data:
      opcode: QUERY
      status: NOERROR
      id: 17687
      flags: rd ad
      QUESTION: 1
      ANSWER: 0
      AUTHORITY: 0
      ADDITIONAL: 1
      OPT_PSEUDOSECTION:
        EDNS:
          version: 0
          flags:
          udp: 4096
          NSID
          COOKIE: ba61ac759b7b483f
      QUESTION_SECTION:
        - va. IN NS