Better handle jobs with no inputs

Control/AthenaConfiguration/python/AllConfigFlags.py

Control/AthenaConfiguration/python/AutoConfigFlags.py

Control/AthenaConfiguration/python/GeoModelConfigFlags.py

Control/AthenaMP/python/AthenaMPConfig.py

...anceMonitoring/PerfMonTests/test/test_perfMonMTSvc_mt1.py

...anceMonitoring/PerfMonTests/test/test_perfMonMTSvc_mt8.py

...eMonitoring/PerfMonTests/test/test_perfMonMTSvc_serial.py

...etDetDescr/PixelGeoModelXml/test/ITkPixelGMConfig_test.py

...etDetDescr/StripGeoModelXml/test/ITkStripGMConfig_test.py

...LArCalibProcessing/python/LArCalib_Delay_OFCCaliConfig.py

...ample/LArCalibProcessing/python/LArCalib_OFCPhysConfig.py

...CalibProcessing/python/LArCalib_PedestalAutoCorrConfig.py

...libProcessing/python/LArCalib_PhysWavePredictionConfig.py

...ArCalibProcessing/python/LArCalib_PileUpAutoCorrConfig.py

...ple/LArCalibProcessing/python/LArCalib_RTMParamsConfig.py

Reconstruction/RecJobTransforms/test/RecoSteeringTest.py

.../egamma/egammaPerformance/python/SetupEgammaMonitoring.py

...tion/SimuJobTransforms/python/CommonSimulationSteering.py

Simulation/SimuJobTransforms/python/G4AtlasAlg_Skeleton.py

Simulation/SimuJobTransforms/python/ISF_Skeleton.py