FolderListModel: prevent assertion failure when filter selects 0 files

If you do nameFilters = "*.foo" and there are no matching files,
there was an assertion failure due to inserting rows from 0 to -1:
ASSERT: "last >= first" in file itemmodels/qabstractitemmodel.cpp

Change-Id: I4a3642906a4588bebc699b8d99438726676fb4ca
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/imports/folderlistmodel/qquickfolderlistmodel.cpp b/src/imports/folderlistmodel/qquickfolderlistmodel.cpp
index 3e3a824648..421e215066 100644
--- a/src/imports/folderlistmodel/qquickfolderlistmodel.cpp
+++ b/src/imports/folderlistmodel/qquickfolderlistmodel.cpp
@@ -159,8 +159,10 @@ void QQuickFolderListModelPrivate::_q_directoryUpdated(const QString &directory,
         data = list;
         q->beginRemoveRows(parent, fromIndex, toIndex);
         q->endRemoveRows();
-        q->beginInsertRows(parent, fromIndex, list.size()-1);
-        q->endInsertRows();
+        if (list.size() > 0) {
+            q->beginInsertRows(parent, fromIndex, list.size()-1);
+            q->endInsertRows();
+        }
         emit q->rowCountChanged();
     } else if (data.size() < list.size()) {
         //qDebug() << "File added. FromIndex: " << fromIndex << " toIndex: " << toIndex << " list size: " << list.size();