sync: Allow exercice directory to do not have identifier

admin/sync/exercices.go

@@ -102,9 +102,12 @@ func BuildExercice(i Importer, theme *fic.Theme, epath string, dmap *map[int64]*
 	var err error
 	eid, e.Title, err = parseExerciceDirname(edir)
 	if err != nil {
+		// Ignore eid if we are certain this is an exercice directory, eid will be 0
+		if !i.Exists(path.Join(epath, "title.txt")) {
 			errs = append(errs, NewExerciceError(e, fmt.Errorf("unable to parse exercice directory: %w", err), theme))
 			return nil, p, eid, edir, errs
 		}
+	}
 
 	// Get exceptions
 	exceptions = LoadExerciceException(i, theme, e, exceptions)