Remove redundant code

app/corpora/routes.py

@@ -149,7 +149,7 @@ def create_corpus_file(corpus_id):
                 mimetype='application/vrt+xml',
                 corpus=corpus
             )
-        except OSError:
+        except (AttributeError, OSError):
             abort(500)
         corpus.status = CorpusStatus.UNPREPARED
         db.session.commit()