Qt: correctly clear the info panel cover Art

modules/gui/qt4/components/info_panels.cpp

@@ -335,6 +335,7 @@ void MetaPanel::clear()
     nowplaying_text->clear();
     publisher_text->clear();
     encodedby_text->clear();
+    art_cover->clear();
 
     setEditMode( false );
     emit uriSet( "" );

modules/gui/qt4/components/interface_widgets.cpp

@@ -722,6 +722,11 @@ void CoverArtLabel::setArtFromFile()
     THEMIM->getIM()->setArt( p_item, fileUrl );
 }
 
+void CoverArtLabel::clear()
+{
+    showArtUpdate( "" );
+}
+
 TimeLabel::TimeLabel( intf_thread_t *_p_intf, TimeLabel::Display _displayType  )
     : ClickableQLabel(), p_intf( _p_intf ), bufTimer( new QTimer(this) ),
       buffering( false ), showBuffering(false), bufVal( -1 ), displayType( _displayType )

modules/gui/qt4/components/interface_widgets.hpp

@@ -289,6 +289,7 @@ public slots:
     void showArtUpdate( input_item_t * );
     void askForUpdate();
     void setArtFromFile();
+    void clear();
 };
 
 #endif