Fixed an issue where an error 'e' is ignored after readdir.
Fixed an issue where an error 'e' is ignored after readdir.

There is an issue in Propfind method.
I have found which an error got by readdir's callback is ignored.
By this issue, WebDAV server crashes when I return error in readdir's callback.
OpenMarshal/npm-WebDAV-Server,OpenMarshal/npm-WebDAV-Server