Put the summary of the bug you're having here

What I expected to happen was...:
The game would not crash, and the resource pack would be loaded

What actually happened was...:
The game crashed when I converted the texture pack to a resource pack, while still having the Resource Packs menu open

Steps to Reproduce:
1. Open the Resource Packs menu by Options -> Resource Packs
2. Convert any texture pack (oCd 1.5 by Disco was used) to resource pack using the converter
3. Move the folder of converted texture pack to resource pack folder (.minecraft\resourcepacks)
4. Attempt to switch to the newly converted resource pack