safify buildingplan data access

Author: myk002

plugins/buildingplan/buildingplan.cpp

@@ -57,8 +57,7 @@ static Tasks tasks;
 void PlannedBuilding::remove(color_ostream &out) {
     DEBUG(control,out).print("removing persistent data for building %d\n", id);
     World::DeletePersistentData(bld_config);
-    if (planned_buildings.count(id))
-        planned_buildings.erase(id);
+    planned_buildings.erase(id);
 }
 
 static const int32_t CYCLE_TICKS = 599; // twice per game day

plugins/buildingplan/plannedbuilding.cpp

@@ -103,7 +103,7 @@ PlannedBuilding::PlannedBuilding(color_ostream &out, df::building *bld, HeatSafe
     bld_config.set_int(BLD_CONFIG_ID, id);
     bld_config.set_int(BLD_CONFIG_HEAT, heat_safety);
     bld_config.set_str(serialize(vector_ids, item_filters));
-    DEBUG(control,out).print("serialized state for building %d: %s\n", id, bld_config.val().c_str());
+    DEBUG(control,out).print("serialized state for building %d: %s\n", id, bld_config.get_str().c_str());
 }
 
 PlannedBuilding::PlannedBuilding(color_ostream &out, PersistentDataItem &bld_config)