NullPointerException in MapIconsTransformer

[mas6y6]

So after a shit load of digging i found this crash in MapIconsTransformer where a bunch of nulls where passed into java inputs

Class: https://github.com/mas6y6/PackConverter/blob/5c7d67081b389afdc9badaab59db4f6a11f3f819/converter/src/main/java/org/geysermc/pack/converter/type/texture/transformer/type/ui/MapIconsTransformer.java

I am currently working on a fix but keeping this issue open until then

[mas6y6]

This issue cases all packs to fail to compile