lint fix return None to return self in discrete controller function

Malmahrouqi3 · Malmahrouqi3 · commit 31d80b9e25a1 · 2026-03-30T10:23:51.000-04:00
diff --git a/rocketpy/rocket/rocket.py b/rocketpy/rocket/rocket.py
@@ -1971,7 +1971,7 @@ def add_discrete_controller(
 
         self._add_controllers(controller)
 
-        return None
+        return self
 
     def add_continuous_controller(
         self,
