Change properties of SCT_RawDataByteStreamCnv/share/testSCTDecode.py (ATLASRECTS-4939)

Change properties of SCT_RawDataByteStreamCnv/share/testSCTDecode.py to cope with !21024 (merged)

Add empty checks to SiClusterizationTool/src/ClusterMakerTool.cxx so that we can disable Pixel part.

https://its.cern.ch/jira/browse/ATLASRECTS-4939

http://atlas-computing.web.cern.ch/atlas-computing/links/distDirectory/gitwww/MASTERWebArea/nicos_web_areamaster_Athena_x86_64slc6gcc8opt64BS6G8AthenaOpt/NICOS_TestLog_2019-04-16T2148/InnerDetector_InDetEventCnv_SCT_RawDataByteStreamCnv___SCT_RawDataByteStreamCnvConf__SCT_RawDataByteStreamCnvTest__m.html