There is an error in list function of subvertpy Client when path parameter ends with trailing slash.

This error also displays when running tests.

output:

python: /build/buildd/subversion-1.8.8/subversion/libsvn_subr/dirent_uri.c:1499: uri_skip_ancestor: Assertion `svn_uri_is_canonical(child_uri, ((void *)0))' failed.

Subvertpy version is 0.9.1

Presented changes cut trailing slash and fixes error.

All tests:

1483 tests run in 121.9 seconds. 

45 skipped (1438 tests passed)
**./reviewboard/manage.py test -- reviewboard.scmtools.tests:SubvertpyTests **

Testing SVN (subvertpy) parsing SVN diff with binary file ... passed

Testing SVN keyword collapsing ... passed

Testing parsing SVN diff with added empty file ... passed

Testing parsing SVN diff with deleted empty file ... passed

Testing SVN (subvertpy) parsing diff with spaces in filenames ... passed

Testing SVN (subvertpy) get_branches ... passed

Testing SVN (subvertpy) get_change ... passed

Testing SVN (subvertpy) get_commits ... passed

Testing SVN (subvertpy) get_commits with branch ... passed

Testing SVN (subvertpy) get_file ... passed

Testing SVN (subvertpy) with basic SVNTool API ... passed

Testing SVN (subvertpy) parsing diff with keywords ... passed

Testing correct concat svn repopath and path ... passed

Testing SVN (subvertpy) revision number parsing ... passed

Testing SVN (subvertpy) with a SSH-backed Subversion repository ... skipped

Testing SVN (subvertpy) with a SSH-backed Subversion repository with a LocalSite ... skipped

Testing SVN (subvertpy) parsing SVN 1.6 diff with property changes ... passed

Testing SVN (subvertpy) parsing SVN 1.7+ diff with property changes ... passed

Testing SVN (subvertpy) parsing diff with unicode characters ... passed

Testing SVN (subvertpy) parsing diff with unterminated keywords ... passed

Testing SVN (subvertpy) with UTF-8 files with keywords ... passed