plasmashell: Check for null view in ShellCorona::panelContainmentDestroyed
when applying a new layout, panelContainmentDestroyed will be called when m_panelViews is already empty, so we need to check on auto view = m_panelViews.take(cont);
when applying a new layout, panelContainmentDestroyed will be called when m_panelViews is already empty, so we need to check on auto view = m_panelViews.take(cont);