panic: cast causes pointer to be null when creating an OwningGroup without entities

[Nomy1]

Steps to reproduce

Run the view_vs_groups.zig example but comment the createEntities(&reg) function https://raw.githubusercontent.com/prime31/zig-ecs/master/examples/view_vs_group.zig

Expected

Program to run as normal. There won't be anything to iterate, but that shouldn't crash the program.

Actual

panic: cast causes pointer to be null