Load Error Bug with UndertaleModLib.Models.UndertaleSprite

[MarcelineNoble]

Describe the bug

When trying to open the .data win file for the video game brand-new-friends
An error occurs where the ModTool is failing to load a sprite this error happens in the Bleeding Edge version and the non bleeding Edge version of UndertaleModTool as well

Reproducing steps

1. this error occurs in brandnewfriends_v210904_4
2. open the .data win file using the Latest version
3. the errror shown should occur

Setup Details

1. UnderTaleModTool: v0.5.1.0 (Bleeding Edge version) this bug also occurs in the non Bleeding edge version of v0.5.1.0
2. OperatingSystem - Windows 10 home 64 bit - Version 10.0.19045 Build 19045
3. GameMakerGameUsed - Brand New Friends - https://crispybusiness.itch.io/brand-new-friends

[Jacky720]

Reproduced successfully-- seems the first two sprites get by by just having mask data that's already aligned, and no padding is present on the third (or likely later sprites, for that matter). Possible solution to just downgrade the mask padding alert to a warning? Unless we know how/when/why/if this changed for newer games in general.