- result = QString::compare(a->values.value(role).toString(),
- b->values.value(role).toString());
+ const QString roleValueA = a->values.value(role).toString();
+ const QString roleValueB = b->values.value(role).toString();
+ if (!roleValueA.isEmpty() && roleValueB.isEmpty()) {
+ result = -1;
+ } else if (roleValueA.isEmpty() && !roleValueB.isEmpty()) {
+ result = +1;
+ } else {
+ result = QString::compare(roleValueA, roleValueB);
+ }