Fix minor memory leak in PythonCaller

DRAMSys/traceAnalyzer/businessObjects/pythoncaller.cpp

@@ -126,6 +126,11 @@ PythonCaller::~PythonCaller()
     Py_DECREF(pCalculateMetricsFunction);
     Py_DECREF(pGenPlotsFunction);
     Py_DECREF(pGetMetricsFunction);
+
+    if (pVcdExportFunction)
+        Py_DECREF(pVcdExportFunction);
+
+    Py_DECREF(pVcdExportDependenciesFunction);
     Py_Finalize();
 }