adding changes so can be seen in a draft MR for hackathon

MuonSpectrometer/MuonCnv/MuonJiveXML/src/CscPrepDataRetriever.cxx

@@ -38,7 +38,11 @@ namespace JiveXML {
     ATH_MSG_VERBOSE("Retrieving " << dataTypeName()); 
 
     SG::ReadHandle<Muon::CscPrepDataContainer> cscContainer(m_sgKey);
-
+    
+    if (!cscContainer.isValid()) {
+      ATH_MSG_WARNING("Unable to retrieve: " << m_sgKey);
+      return(StatusCode::SUCCESS);
+    }
 
     int ndata = 0;
     Muon::CscPrepDataContainer::const_iterator containerIt;

MuonSpectrometer/MuonCnv/MuonJiveXML/src/MMPrepDataRetriever.cxx

@@ -46,6 +46,11 @@ namespace JiveXML {
 
     SG::ReadHandle<Muon::MMPrepDataContainer> mmContainer(m_sgKey);
 
+    if (!mmContainer.isValid()) {
+      ATH_MSG_WARNING("Unable to retrieve: " << m_sgKey);
+      return(StatusCode::SUCCESS);
+    }
+
     int ndata = 0;
     for (const auto mmCollection : *mmContainer){
        ndata += mmCollection->size();

MuonSpectrometer/MuonCnv/MuonJiveXML/src/MdtPrepDataRetriever.cxx

@@ -40,7 +40,10 @@ namespace JiveXML {
     ATH_MSG_VERBOSE("Retrieving " << dataTypeName()); 
 
     SG::ReadHandle<Muon::MdtPrepDataContainer> mdtContainer(m_sgKey);
-
+    if (!mdtContainer.isValid()) {
+      ATH_MSG_WARNING("Unable to retrieve: " << m_sgKey);
+      return(StatusCode::SUCCESS);
+    }
 
     int ndata = 0;
     Muon::MdtPrepDataContainer::const_iterator containerIt;

MuonSpectrometer/MuonCnv/MuonJiveXML/src/RpcPrepDataRetriever.cxx

@@ -40,6 +40,11 @@ namespace JiveXML {
 
     SG::ReadHandle<Muon::RpcPrepDataContainer> rpcContainer(m_sgKey);
 
+    if (!rpcContainer.isValid()) {
+      ATH_MSG_WARNING("Unable to retrieve: " << m_sgKey);
+      return(StatusCode::SUCCESS);
+    }
+
     int ndata = 0;
     Muon::RpcPrepDataContainer::const_iterator containerIt;
     for (containerIt=rpcContainer->begin(); containerIt!=rpcContainer->end(); ++containerIt) {

MuonSpectrometer/MuonCnv/MuonJiveXML/src/TgcPrepDataRetriever.cxx

@@ -38,6 +38,11 @@ namespace JiveXML {
 
     SG::ReadHandle<Muon::TgcPrepDataContainer> tgcContainer(m_sgKey);
 
+    if (!tgcContainer.isValid()) {
+      ATH_MSG_WARNING("Unable to retrieve: " << m_sgKey);
+      return(StatusCode::SUCCESS);
+    }
+
     int ndata = 0;
     Muon::TgcPrepDataContainer::const_iterator containerIt;
     for (containerIt=tgcContainer->begin(); containerIt!=tgcContainer->end(); ++containerIt) {

MuonSpectrometer/MuonCnv/MuonJiveXML/src/TrigMuonROIRetriever.cxx

@@ -28,7 +28,11 @@ namespace JiveXML {
     if (msgLvl(MSG::DEBUG)) msg(MSG::DEBUG) << "Retrieving " << dataTypeName() << endmsg; 
 
     SG::ReadHandle<LVL1_ROI> roi(m_sgKey);
-
+    
+    if (!roi.isValid()) {
+      ATH_MSG_WARNING("Unable to retrieve: " << m_sgKey);
+      return(StatusCode::SUCCESS);
+    }
     int nRoIs = roi->getMuonROIs().size();
 
     DataVect phi; phi.reserve(nRoIs);

MuonSpectrometer/MuonCnv/MuonJiveXML/src/TrigRpcDataRetriever.cxx

@@ -42,6 +42,11 @@ namespace JiveXML {
     // retrieve the collection of RDO
     SG::ReadHandle<RpcPadContainer> rdoContainer(m_sgKey);
 
+    if (!rdoContainer.isValid()) {
+      ATH_MSG_WARNING("Unable to retrieve: " << m_sgKey);
+      return(StatusCode::SUCCESS);
+    }
+
     int ndata=0;
     for (auto containerIt=rdoContainer->begin(); containerIt!=rdoContainer->end(); ++containerIt) {
       ndata += (*containerIt)->size();

MuonSpectrometer/MuonCnv/MuonJiveXML/src/sTgcPrepDataRetriever.cxx

@@ -45,6 +45,11 @@ namespace JiveXML {
 
     SG::ReadHandle<Muon::sTgcPrepDataContainer> stgcContainer(m_sgKey);
 
+    if (!stgcContainer.isValid()) {
+      ATH_MSG_WARNING("Unable to retrieve: " << m_sgKey);
+      return(StatusCode::SUCCESS);
+    }
+
     int ndata = 0;
     for (const auto stgcCollection : *stgcContainer){
        ndata += stgcCollection->size();