[Base] remove some more superfluous nullptr checks

src/Base/PyObjectBase.cpp

@@ -353,7 +353,7 @@ int PyObjectBase::__setattro(PyObject *obj, PyObject *attro, PyObject *value)
 
     //Hint: In general we don't allow to delete attributes (i.e. value=0). However, if we want to allow
     //we must check then in _setattr() of all subclasses whether value is 0.
-    if ( value==nullptr ) {
+    if (!value) {
         PyErr_Format(PyExc_AttributeError, "Cannot delete attribute: '%s'", attr);
         return -1;
     }