Make sure TORQUE_TARGET_PROPERTIES is populated before using it

Engine/source/CMakeLists.txt

@@ -402,7 +402,9 @@ endif()
 target_compile_definitions(${TORQUE_APP_NAME} PUBLIC ${TORQUE_COMPILE_DEFINITIONS})
 target_link_libraries(${TORQUE_APP_NAME} ${TORQUE_LINK_LIBRARIES})
 target_link_options(${TORQUE_APP_NAME} PUBLIC ${TORQUE_LINK_OPTIONS})
-set_target_properties(${TORQUE_APP_NAME} PROPERTIES ${TORQUE_TARGET_PROPERTIES})
+if (TORQUE_TARGET_PROPERTIES)
+   set_target_properties(${TORQUE_APP_NAME} PROPERTIES ${TORQUE_TARGET_PROPERTIES})
+endif (TORQUE_TARGET_PROPERTIES)
 target_include_directories(${TORQUE_APP_NAME} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR} "${CMAKE_BINARY_DIR}/temp" ${TORQUE_INCLUDE_DIRECTORIES})
 target_compile_features(${TORQUE_APP_NAME} PRIVATE cxx_std_20)