Merge pull request #1313 from rht/fix_sugarscape_cg

fix: sugarscape_cg: Use better way to check if a cell is occupied by SsAgent

Author: Corvince

examples/sugarscape_cg/sugarscape_cg/agents.py

@@ -34,7 +34,7 @@ def get_sugar(self, pos):
 
     def is_occupied(self, pos):
         this_cell = self.model.grid.get_cell_list_contents([pos])
-        return len(this_cell) > 1
+        return any(isinstance(agent, SsAgent) for agent in this_cell)
 
     def move(self):
         # Get neighborhood within vision