watch out for optional last.fm dependencies in AlbumCoverChoiceController -> fixes issue #1393

from the creators of "david is always right" movie -> maybe fix issue #1396

src/library/libraryfilterwidget.cpp

@@ -194,7 +194,7 @@ void LibraryFilterWidget::SetFilterHint(const QString& hint) {
 
 void LibraryFilterWidget::SetDuplicatesOnly(bool duplicates_only) {
   // no filtering in duplicates_only mode
-  ui_->filter->setText("");
+  static_cast<QLineEdit*>(ui_->filter)->clear();
   ui_->filter->setEnabled(!duplicates_only);
 
   model_->SetFilterDuplicatesOnly(duplicates_only);

src/ui/albumcoverchoicecontroller.cpp

@@ -16,15 +16,18 @@
    along with Clementine.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include "core/albumcoverfetcher.h"
 #include "core/albumcoverloader.h"
 #include "library/librarybackend.h"
 #include "ui/albumcoverchoicecontroller.h"
 #include "ui/albumcovermanager.h"
-#include "ui/albumcoversearcher.h"
 #include "ui/coverfromurldialog.h"
 #include "ui/iconloader.h"
 
+#ifdef HAVE_LIBLASTFM
+# include "ui/albumcoversearcher.h"
+# include "core/albumcoverfetcher.h"
+#endif
+
 #include <QAction>
 #include <QCryptographicHash>
 #include <QDialog>

src/ui/albumcoverchoicecontroller.h

@@ -23,8 +23,11 @@
 #include <QMenu>
 #include <QWidget>
 
-class AlbumCoverFetcher;
-class AlbumCoverSearcher;
+#ifdef HAVE_LIBLASTFM
+  class AlbumCoverFetcher;
+  class AlbumCoverSearcher;
+#endif
+
 class CoverFromURLDialog;
 class LibraryBackend;
 class Song;