Items with no hand coverage can still be damaged from punching

[ghost]

Describe the bug

Items that cover the hand, but don't have a coverage value can still be damaged by attacking barehanded.

Steps To Reproduce

1. Create an item that covers the hand with 0% coverage.
2. Wear the item.
3. Punch monsters with your fists.
4. You will eventually damage the item.

Expected behavior

A minimum coverage value to be considered as an unarmed weapon.

Screenshots

Versions and configuration

• OS: Windows
  • OS Version: 10.0 1909
• Game Version: 0.E-4401-gea9b62d [64-bit]
• Graphics Version: Tiles
• Game Language: English [en]
• Mods loaded: [
  Dark Days Ahead [dda],
  Magiclysm [magiclysm],
  Aftershock [aftershock],
  Blaze Industries [blazeindustries],
  C.R.I.T Expansion Mod [crt_expansion],
  DinoMod [DinoMod],
  Alternative Map Key [alt_map_key],
  Mythical Martial Arts [MMA],
  Disable NPC Needs [no_npc_food],
  Fuji's Military Profession Pack [fuji_mpp],
  Stats Through Kills [stats_through_kills],
  SpeedyDex [speedydex]
  ]

Additional context

Likely related to #41209.