Fixed crash of non-precached model for Entity.set_model. (#439)

Author: CookStar

addons/source-python/packages/source-python/entities/_base.py

@@ -22,6 +22,7 @@
 from entities.constants import INVALID_ENTITY_INDEX
 #   Engines
 from engines.precache import Model
+from engines.server import engine_server
 from engines.sound import Attenuation
 from engines.sound import Channel
 from engines.sound import Pitch
@@ -434,6 +435,9 @@ def set_model(self, model):
         """
         if isinstance(model, Model):
             model = model.path
+        elif isinstance(model, str):
+            if not engine_server.is_model_precached(model):
+                raise ValueError(f'Model is not precached: {model}')
 
         return [model]