QAbstractItemView::sizeHintForColumn() crashes if no delegate for an index

Program crashes if you call QAbstractItemView::sizeHintForColumn() and there's no delegate for an index.

Problem is on row 3056 of file qabstractitemview.cpp:

int hint = d->delegateForIndex(index)->sizeHint(option, index).width();

It is legitimate for delegateForIndex() to return nullptr.
Suggest to write it similar to:

QAbstractItemDelegate *id = d->delegateForIndex(index);
int hint = id ? id->sizeHint(option, index).width() : 0;