NoteEntity: Always initialize arrays

The `create()` function did not initialize all arrays, which caused them to be `undefined` instead of empty.

Signed-off-by: David Mehren <git@herrmehren.de>

src/notes/note.entity.ts

@@ -71,6 +71,9 @@ export class Note {
     newNote.alias = alias;
     newNote.viewcount = 0;
     newNote.owner = owner;
+    newNote.authorColors = [];
+    newNote.userPermissions = [];
+    newNote.groupPermissions = [];
     return newNote;
   }
 }