ComicInfo::getTypeString: Return an empty string for unhandled enums (#403)

* ComicInfo::getTypeString: Add default return for unhandled enum

* CXX flags: Promote warnings about missing branches in enum-based switches as errors

* Add missing case in switch

* Catch conversion errors in debug mode and silence missing return warnings

* Replace default with missing cases

* ComicInfo::getTypeString: Use QStringLiterals

* Revert "CXX flags: Promote warnings about missing branches in enum-based switches as errors"

This reverts commit d22c115925.

---------

Co-authored-by: Luis Ángel San Martín <luisangelsm@gmail.com>

YACReaderLibrary/db/comic_model.cpp

@@ -172,7 +172,10 @@ bool ComicModel::dropMimeData(const QMimeData *data, Qt::DropAction action, int
         case ReadingList:
             DBHelper::reasignOrderToComicsInReadingList(sourceId, allComicIds, db);
             break;
-        default:
+        case Folder:
+        case Reading:
+        case Recent:
+        case SearchResult:
             break;
         }
         connectionName = db.connectionName();
@@ -1307,6 +1310,9 @@ void ComicModel::deleteComicsFromSpecialList(const QList<QModelIndex> &comicsLis
     case ReadingListModel::TypeSpecialList::Favorites:
         deleteComicsFromFavorites(comicsList);
         break;
+    case ReadingListModel::TypeSpecialList::Recent:
+        // do nothing, recent is read only
+        break;
     }
 }