Resolve "FOV of the players, fog-of-war like vision"

Closes #44 (closed)

overcooked_simulator/gui_2d_vis/drawing.py

@@ -91,7 +91,7 @@ class Visualizer:
             grid_size,
         )
 
-        if "view_restriction" in state:
+        if "view_restriction" in state and state["view_restriction"]:
             direction = state["view_restriction"][0]
             angel = state["view_restriction"][1]
             # rotate direction vector in both direction with the angel