Fix segmentation fault due to calling methods on NULL ReadyBatch Object

DRAMSys/simulator/src/controller/scheduler/SMS.cpp

@@ -133,6 +133,11 @@ bool SMS::selectSJF(sc_time memClk, std::map<Thread, ReadyBatch*>::iterator &las
 
 bool SMS::selectRR(sc_time memClk, std::map<Thread, ReadyBatch*>::iterator &nextSelectedThread)
 {
+  // no request for this channel, the readybatches map is empty then return
+  if (readybatches.empty()) {
+    return false;
+  }
+
   // pick a non-empty ready batch
   std::map<Thread, ReadyBatch*>::iterator savedOriginalNextSelectedThread = nextSelectedThread;
   while ((*nextSelectedThread).second->isEmpty())

DRAMSys/simulator/src/simulation/TracePlayerListener.h

@@ -43,6 +43,7 @@ class TracePlayerListener
 public:
     virtual void tracePlayerTerminates() = 0;
     virtual void transactionFinished() = 0;
+    virtual ~TracePlayerListener(){};
 };
 
 #endif // TRACEPLAYERLISTENER_H

DRAMSys/simulator/src/simulation/TraceSetup.h

@@ -53,6 +53,7 @@ public:
 
     virtual void tracePlayerTerminates() override;
     virtual void transactionFinished() override;
+    virtual ~traceSetup(){};
 
 private:
     unsigned int NumberOfTracePlayers;