useartwork = 1 (default) causes objects to not spawn, if no models provided on DL client

[leftie1989]

Describe the bug
If you use the useartwork set to ON, which it is by default, objects may not spawn when no custom models are loaded to start with. This issue only applies to CLIENTS using 0.3DL-R1, regular 0.3.7 clients see objects normally.
This was tested on Sumo Server by varying players, and restart server with useartwork 0 corrected it.

To Reproduce
Steps to reproduce the behavior:

1. Turn on DL, or remove useartwork 0 from config
2. Join server
3. Objects that were loaded at OnGameModeInit BEFORE you join may not spawn, but any made after you join spawn normally

Expected behavior
Objects to spawn correctly regardless of if you have defined any custom models

Screenshots and/or logs

Release version
omp server version 'omp 1.1.0.2612'