The minecraft:first_to_succeed sequence handler runs all actions in the sequence until it hits one that was successful and then returns true. The sequence handler is unsuccessful if all actions were executed unsuccessfully.

{
  "type": "minecraft:sequence",
  "handler": "minecraft:first_to_succeed",
  "entries": [
    {
      "action": {
        "type": "minecraft:place_carved_pumpkin",
        "position": "target"
      }
    },
    {
      "action": {
        "type": "minecraft:equip_entity_at_position",
        "position": "target"
      }
    }
  ]
}