Warn about unimplemented conditional branch flags. Return always true…

… for "BGM looped once" (see EasyRPG#655)

src/game_interpreter_map.cpp

@@ -1921,9 +1921,13 @@ bool Game_Interpreter_Map::CommandConditionalBranch(RPG::EventCommand const& com
 			break;
 		case 8:
 			// TODO Key decision initiated this event
+			Output::Warning("Branch: Started using Key not implemented");
 			break;
 		case 9:
-			// TODO BGM Playing
+			// TODO BGM looped at least once
+			Output::Warning("Branch: BGM looped once not implemented");
+			// Lie and say yes...
+			result = true;
 			break;
 		case 10:
 			value1 = Main_Data::game_party->GetTimer(Main_Data::game_party->Timer2);