App: Prevent exceptions in destructors

Coverity issues 251332 and 356538. These destructors call methods
that could throw exceptions. Catch them and convert to console
print statements to prevent calls to `terminate()`.

src/App/PropertyPythonObject.cpp

@@ -48,7 +48,11 @@ PropertyPythonObject::~PropertyPythonObject()
     // this is needed because the release of the pickled object may need the
     // GIL. Thus, we grab the GIL and replace the pickled with an empty object
     Base::PyGILStateLocker lock;
-    this->object = Py::Object();
+    try {
+        this->object = Py::Object();
+    } catch (Py::TypeError &) {
+        Base::Console().Warning("Py::TypeError Exception caught while destroying PropertyPythonObject\n");
+    }
 }
 
 void PropertyPythonObject::setValue(const Py::Object& py)