Fail on unsupported asset template trigger objects

When the bool after USE_TRIGGER / LOOT_TRIGGER is set, the client
(sb.exe 0xC46DE0) instantiates a trigger object by name and loads
extra data from the stream. The parser silently ignored the branch,
which would desync the rest of the template. Raise instead.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

mbEditorPro2.0/arcane/objects/ArcCityAssetTemplate.py

@@ -130,14 +130,17 @@ class ArcCityAssetTemplate():
         self.template_energy_set = stream.read_dword()
         self.template_use_trigger = stream.read_string()
 
+        # When set, the client builds a trigger object named by the
+        # preceding string and loads its data from the stream.  The
+        # trigger formats are not implemented; fail rather than desync.
         self.template_unknown_check1 = stream.read_bool()
         if self.template_unknown_check1:
-            pass
+            raise NotImplementedError('use trigger object data is not supported')
         self.template_loot_trigger = stream.read_string()
 
         self.template_unknown_check2 = stream.read_bool()
         if self.template_unknown_check2:
-            pass
+            raise NotImplementedError('loot trigger object data is not supported')
 
         self.has_embedded_template = stream.read_bool()
         if self.has_embedded_template: