Ensure grasspatches info is only collected if gras is true #181
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the datacollector allways includes grasspatches even if grass is False. This is breaking (the proposed changes to agent storage in Model)[https://github.com/projectmesa/mesa/pull/2251#issue-2488519860].
The underlying problem is that
Model.get_agents_of_type
now raises aKeyError
if type does not exist. I think this is desirable behavior becuase errrors should not be passed over in silence. But this requires fixing the wolf sheep example as done here.