Add out-of-bounds check to get_sdf_name()

src/scenario/scenario.cpp

@@ -607,6 +607,9 @@ std::string cScenario::get_feature_flag(std::string flag) {
 }
 
 std::string cScenario::get_sdf_name(int row, int col) {
+	if(row < 0 || row >= SDF_ROWS || col < 0 || col >= SDF_COLUMNS){
+		throw "Tried to access SDF name for out-of-bounds flag (" + std::to_string(row) + ", " + std::to_string(col) + ")";
+	}
 	if(sdf_names.find(row) == sdf_names.end())
 		return "";
 	if(sdf_names[row].find(col) == sdf_names[row].end())