Fix bim tool crash (#2445)

* Attempt to wait for assets (triggers infinite loop)

* Using timer instead of sleep

* remove sleep import

src/blenderbim/blenderbim/bim/module/model/data.py

@@ -143,6 +143,12 @@ class AuthoringData:
                 obj = new_obj
         obj.asset_mark()
         obj.asset_generate_preview()
+
+        def wait_for_asset_previews_generation(check_interval_seconds=0.03):
+            if bpy.app.is_job_running("RENDER_PREVIEW"):
+                print(f"{obj.name}: Generating preview...")
+                return check_interval_seconds
+            else:
                 icon_id = obj.preview.icon_id
                 if ifc_class not in cls.data["preview_constr_types"]:
                     cls.data["preview_constr_types"][ifc_class] = {}
@@ -156,6 +162,10 @@ class AuthoringData:
                     # Instead, we only "hide" it by unlinking it from all collections.
                     for collection in obj.users_collection:
                         collection.objects.unlink(obj)
+                print(f"{obj.name}: Preview generated!")
+                return None
+
+        bpy.app.timers.register(wait_for_asset_previews_generation)
 
     @classmethod
     def assetize_relating_type_from_selection(cls, browser=False):