Music lua: Return nil for invalid players and non-nil for valid players

# Conflicts:
#	src/lua_baselib.c

src/lua_baselib.c

@@ -2291,7 +2291,10 @@ static int lib_sPauseMusic(lua_State *L)
 			return LUA_ErrInvalid(L, "player_t");
 	}
 	if (!player || P_IsLocalPlayer(player))
+	{
 		S_PauseAudio();
+		lua_pushboolean(L, true);
+	}
 	else
 		lua_pushnil(L);
 	return 1;
@@ -2314,7 +2317,10 @@ static int lib_sResumeMusic(lua_State *L)
 			return LUA_ErrInvalid(L, "player_t");
 	}
 	if (!player || P_IsLocalPlayer(player))
+	{
 		S_ResumeAudio();
+		lua_pushboolean(L, true);
+	}
 	else
 		lua_pushnil(L);
 	return 1;