Application Output: Close pane if the last tab is closed
Application Output: Close pane if the last tab is closed

Change-Id: I782aab3895f27b801c9517cf9ef21f4a474612fd
Task-number: QTCREATORBUG-14395
Reviewed-by: Mitch Curtis <a74594a5101269175fe1b140badc4c0b6f699d25@digia.com>
Reviewed-by: Eike Ziller <c142da16c73a95a82d35191bcc55b22835617128@theqtcompany.com>

xianian/qt-creator,xianian/qt-creator,martyone/sailfish-qtcreator,xianian/qt-creator,xianian/qt-creator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,xianian/qt-creator,xianian/qt-creator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,xianian/qt-creator,xianian/qt-creator,martyone/sailfish-qtcreator,xianian/qt-creator,martyone/sailfish-qtcreator