Fridge handles null goal.

Change-Id: I4c9bf6a6e51f351aad3957ed22e8f4eedbb6ea35
diff --git a/frc971/control_loops/fridge/fridge.h b/frc971/control_loops/fridge/fridge.h
index 87dbfa4..eecfe1b 100644
--- a/frc971/control_loops/fridge/fridge.h
+++ b/frc971/control_loops/fridge/fridge.h
@@ -40,7 +40,7 @@
 };
 
 class Fridge
-    : public aos::controls::ControlLoop<control_loops::FridgeQueue> {
+    : public aos::controls::ControlLoop<control_loops::FridgeQueue, false> {
  public:
   explicit Fridge(
       control_loops::FridgeQueue *fridge_queue = &control_loops::fridge_queue);