Fix #7433: don't use AirportSpec substitute if it's not set #7435
+1
−0
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Maybe not the right fix, but it works.
I think
subst_id
can never be AT_INVALID, because default value forOverrideManagerBase::mappingID[].substitute_id
is 0. But defaultingsubstitute_id
toinvalid_ID
will probably need a savegame conversion, and I don't know if changing default substitute value for other managers will break stuff.