fix: process_relic exits early if not carried by a character.

[KheirFerrum]

Purpose of change (The Why)

• fixes Loading relic crashes game in some conditions #6110 which was caused by fix: make relic/artifacts loaded into other items work #6106 causing relics to also be marked to be processed if left unattended. This caused a nullptr situation in enchantment::is_active when it tries to check the carrier for wield, carry, etc.

Describe the solution (The How)

• Adds an escape clause early to the function where if guy is a nullptr it returns false.

Describe alternatives you've considered

Testing

• Loaded provided save from Loading relic crashes game in some conditions #6110 , walked to the end of the northern corridor, no crashing.

Additional context

Checklist

Mandatory

• I wrote the PR title in conventional commit format.
• I ran the code formatter.
• I linked any relevant issues using github keyword syntax like closes #1234 in Summary of the PR so it can be closed automatically.
• I've committed my changes to new branch that isn't main so it won't cause conflict when updating main branch later.
• I understand that, unless specified otherwise, my contributions will fall under the AGPL v3.0 and/or CC-BY-SA 4.0 licenses

[scarf005]

how can const reference even be null aaaaaaaaaaa

[chaosvolt]

Nice. Side note: eventually it'd be nice if some relic recharge types can function when not in a player's inventory, useful mainly for time and solar recharging items so they can better work for faking mundane items (solar-powered electronics for example), but obviously it'd need to not crash.

[KheirFerrum]

Nice. Side note: eventually it'd be nice if some relic recharge types can function when not in a player's inventory, useful mainly for time and solar recharging items so they can better work for faking mundane items (solar-powered electronics for example), but obviously it'd need to not crash.

They should work, this only affects active enchantments.

[chaosvolt]

Another item on the todo list. XD

EDIT: While testing the follow-up PR I found the cube was actually recharging just fine while dropped, so guessing this ability is already available? Nice.