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Of course there's a script; every bitcoin tx output has a script. These challenges use the standard P2PKH script, i.e.:

  scriptPubKey: OP_DUP OP_HASH160 <pubKeyHash> OP_EQUALVERIFY OP_CHECKSIG
  scriptSig: <sig> <pubKey>

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Not every bitcoin tx output.

With taproot (P2TR), scripts are optional, and outputs can be based solely on Schnorr signatures.

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P2TR outputs have a script that always starts with OP_1. That script may or may not commit to a tapscript.