GetCapabilities is sensitive to version ordering

[matthias-mueller]

Description

These two requests should produce correct responses:

http://demo.pycsw.org/cite/csw?service=CSW&acceptVersions=2.0.2,3.0.0&request=GetCapabilities http://demo.pycsw.org/cite/csw?service=CSW&acceptVersions=3.0.0,2.0.2&request=GetCapabilities

However, only the first one succeeds and the second fails. (It seems that pyCSW enforces ascending order.)

Environment

The project's demo server