[Hotfix] v1.6.4: Fix crash involving female Pyroar fusions with exp sprites

[Fontbane]

What are the changes the user will see?

• Fixes a crash where the game would freeze when encountering a fusion with female Pyroar as the secondary mon- specifically when experimental sprites are on.
  

Why am I making these changes?

• People were crashing. Here's one such report.

What are the changes from a developer perspective?

• The game now does not attempt to apply a fusion palette if one fails to generate.

Screenshots/Videos

How to test the changes?

Take attached save to wave xxx3, where you will encounter a Frosmoth/Pyroar fusion. After changing file extension ofc.
sessionData1_Manurh9.txt

Checklist

• I'm using beta as my base branch
• There is no overlap with another PR?
• The PR is self-contained and cannot be split into smaller PRs?
• Have I provided a clear explanation of the changes?
• Have I tested the changes manually?
• Are all unit tests still passing? (npm run test)
  • Have I created new automated tests (npm run create-test) or updated existing tests related to the PR's changes?
• Have I provided screenshots/videos of the changes (if applicable)?
  • Have I made sure that any UI change works for both UI themes (default and legacy)?

Are there any localization additions or changes? If so:

• Has a locales PR been created on the locales repo?
  • If so, please leave a link to it here:
• Has the translation team been contacted for proofreading/translation?

[DayKev]

Huh, it looks like the submodule didn't update correctly?

[DayKev]

Worked this time.