- Slightly improved pieces selection in torrent properties

src/properties_imp.cpp

@@ -277,8 +277,10 @@ void properties::on_select_clicked(){
     }
   }
   // Save filtered pieces to a file to remember them
+  if(selectedIndexes.size() != 0){
     saveFilteredFiles();
   }
+}
 
 void properties::on_okButton_clicked(){
   close();
@@ -303,8 +305,10 @@ void properties::on_unselect_clicked(){
     }
   }
   // Save filtered files to a file to remember them
+  if(selectedIndexes.size() != 0){
     saveFilteredFiles();
   }
+}
 
 void properties::saveFilteredFiles(){
   torrent_info torrentInfo = h.get_torrent_info();