Remove unused _pendingResult ivar and always create a pending result when a return value is expected.
Remove unused _pendingResult ivar and always create a pending result when a return value is expected.

luxiaohan/openxal-csns-luxh,EuropeanSpallationSource/openxal,EuropeanSpallationSource/openxal,EuropeanSpallationSource/openxal,luxiaohan/openxal-csns-luxh,luxiaohan/openxal-csns-luxh,openxal/openxal,EuropeanSpallationSource/openxal,openxal/openxal,openxal/openxal,EuropeanSpallationSource/openxal,luxiaohan/openxal-csns-luxh,openxal/openxal,openxal/openxal