libpng warning: Image height is zero in IHDR

[Nexxo11]

Describe the bug I'm encountering a libpng warning: Image height is zero in IHDR when trying to compile a secondary tileset using Porytiles. This error seems to indicate that one of the images being processed has a height of zero pixels, which could suggest the image is corrupt or malformed.

Additional context Please include:

• porytiles compile-secondary /mnt/c/Users/Usuario/Documents/Decomp/porytiles/tiles/city /mnt/c/Users/Usuario/Documents/Decomp/pokeemerald-expansion/data/tilesets/secondary/city_tiles /mnt/c/Users/Usuario/Documents/Decomp/pokeemerald-expansion/include/constants/metatile_behaviors.h \

Environment (please complete the following information):

• OS [Windows 11 using wsl]
• Porytiles release version: if applicable [1.0.0]

• 

[grunt-lucas]

/mnt/c/Users/Usuario/Documents/Decomp/pokeemerald-expansion/data/tilesets/secondary/city_tiles

If this is your paired primary tileset, it needs to be a Porytiles-format tileset. Unfortunately you cannot currently use compiled Porymap-format tilesets for the paired primary. This is possibly why you are seeing that error message.

I am planning on adding the ability to use a compiled Porymap-format tileset as the paired primary, that's tracked in #47