Remove duplicate "print" statement.

Mark · Mark · commit d65f1d230baa · 2022-06-13T15:01:52.000-05:00
diff --git a/control/passivity.py b/control/passivity.py
@@ -23,7 +23,6 @@ def is_passive(sys):
         "Demonstrating passivity and dissipativity using computational methods." ISIS 8 (2013).
     '''
     if cvx is None:
-        print("cvxopt required for passivity module")
         raise ModuleNotFoundError("cvxopt required for passivity module")
 
     A = sys.A
