lib: BaseRepoController: use webob.exc.HTTPNotFound if possible In the entire code base, the use of 'paste' is very limited. In particular, 'paste.httpexceptions' is only still used in lib/base.py, in three occurrences: - two of them in class BasicAuth which derives from paste.auth.something. Here it probably makes sense to use paste.httpexceptions. - one in BaseRepoController, which has no specific relation to paste. This occurrence can be replaced with webob.exc like in the rest of the code base.