The function `gpu_texture_create_tile_array` checked for a valid
tile ibuf when determining the packing location. During the actual packaging it didn't.
As the tiles are already ignored when selecting the packing location, we
can also ignore it when copying it to the glTexture. Therefore this
patch removes the existing BLI_assert and replaces it with a NULL check.
Reviewed By: Brecht van Lommel
Differential Revision: https://developer.blender.org/D6738
d237681cad