Fix: crash with repo textures if repo missing

[NopoTheGamer]

What

Fixes crash with repo skulls if no repo, main issue was hoppity icon in sb menu (i did not test this)

Images

Changelog Fixes

• Fixed skull crash with missing repo. - nopo

[github-actions]

One or more Detekt Failures were detected:

• SkullTextureHolder.kt#L12: Expected space after opening comment.
• SkullTextureHolder.kt#L13: Line detected, which is longer than the defined maximum line length in the code style.
• SkullTextureHolder.kt#L12: Variable 'ALEX_SKIN_TEXTURE' could be val.