SG-32814 Improve Experience for MoBU (#104)

Author: julien-lang

app_specific/motionbuilder/startup/init_tank.py

@@ -48,9 +48,15 @@ def bootstrap_tank():
     try:
         engine = tank.platform.start_engine(engine_name, context.tank, context)
     except Exception as e:
-        FBMessageBox(
-            "Flow Production Tracking: Error", "Could not start engine: %s" % e, "Ok"
-        )
+        if not isinstance(e, tank.TankError) or not hasattr(
+            e, "_tank_error_raised_already"
+        ):
+            FBMessageBox(
+                "Flow Production Tracking: Error",
+                "Could not start engine: %s" % e,
+                "Ok",
+            )
+
         return
 
     # if a file was specified, load it now