Update examples/virus_antibody/agents.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: colinfrisch

examples/virus_antibody/agents.py

@@ -53,9 +53,6 @@ def __init__(
         self.ko_steps_left = 0
 
     def step(self):
-        if self is None:
-            return
-
         # Acquire a virus target if we don't already have one
         if self.target is None:
             closest = self.find_closest_virus()