message: Fix weird CTest output for optional unit test
diff: @@ -245,7 +245,6 @@ target_include_directories(caf-core-test PRIVATE
  "${CMAKE_BINARY_DIR}" "${CMAKE_CURRENT_SOURCE_DIR}")
  caf_add_test_suites(caf-core-test
  - $<$<BOOL:CAF_ENABLE_EXCEPTIONS>:custom_exception_handler>
  actor_clock
  actor_factory
  actor_lifetime
  @@ -359,3 +358,7 @@ caf_add_test_suites(caf-core-test
  uuid
  variant
  )
  +
  +if(CAF_ENABLE_EXCEPTIONS)
  + caf_add_test_suites(caf-core-test custom_exception_handler)
  +endif()
  