Adding items to a view with no delegate crashes.

If there is no delegate then clear state and return.

Change-Id: I786b9bc4018706797056fbd1ad25d25663102707
Task-number: QTBUG-22379
Reviewed-by: Andrew den Exter

Author: Martin Jones

src/declarative/graphicsitems/qdeclarativegridview.cpp

@@ -2852,6 +2852,11 @@ void QDeclarativeGridView::itemsInserted(int modelIndex, int count)
             addedVisible = true;
         }
         FxGridItem *item = d->createItem(modelIndex + i);
+        if (!item) {
+            // broken or no delegate
+            d->clear();
+            return;
+        }
         d->visibleItems.insert(index, item);
         item->setPosition(colPos, rowPos);
         added.append(item);
@@ -3042,6 +3047,11 @@ void QDeclarativeGridView::itemsMoved(int from, int to, int count)
             FxGridItem *movedItem = moved.take(item->index);
             if (!movedItem)
                 movedItem = d->createItem(item->index);
+            if (!movedItem) {
+                // broken or no delegate
+                d->clear();
+                return;
+            }
             it = d->visibleItems.insert(it, movedItem);
             if (it == d->visibleItems.begin() && firstItem)
                 movedItem->setPosition(firstItem->colPos(), firstItem->rowPos());

src/declarative/graphicsitems/qdeclarativelistview.cpp

@@ -3283,6 +3283,11 @@ void QDeclarativeListView::itemsInserted(int modelIndex, int count)
                 addedVisible = true;
             }
             FxListItem *item = d->createItem(modelIndex + i);
+            if (!item) {
+                // broken or no delegate
+                d->clear();
+                return;
+            }
             d->visibleItems.insert(insertionIdx, item);
             pos -= item->size() + d->spacing;
             item->setPosition(pos);
@@ -3313,6 +3318,11 @@ void QDeclarativeListView::itemsInserted(int modelIndex, int count)
                 addedVisible = true;
             }
             FxListItem *item = d->createItem(modelIndex + i);
+            if (!item) {
+                // broken or no delegate
+                d->clear();
+                return;
+            }
             d->visibleItems.insert(index, item);
             item->setPosition(pos);
             added.append(item);
@@ -3516,6 +3526,11 @@ void QDeclarativeListView::itemsMoved(int from, int to, int count)
             FxListItem *movedItem = moved.take(item->index);
             if (!movedItem)
                 movedItem = d->createItem(item->index);
+            if (!movedItem) {
+                // broken or no delegate
+                d->clear();
+                return;
+            }
             if (item->index <= firstVisible->index)
                 moveBy -= movedItem->size();
             it = d->visibleItems.insert(it, movedItem);