catkin_prepare_release fails with svn upstream

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ros-hydro-catkin 0.5.71-0precise-20130720-2204-+0000

$ catkin_prepare_release
Prepare the source repository for a release.
Repository type: svn
Found packages: openrtm_aist, hrpsys, rtctree, openrtm_common, openhrp3, rtshell, openrtm_aist_python, rtsprofile
Prepare release of version '3.1.5' [Y/n]?
Warning: the following packages do not have a changelog file or entry for version '3.1.5': hrpsys, openhrp3, openrtm_aist, openrtm_aist_python, openrtm_common, rtctree, rtshell, rtsprofile
Continue without changelogs [y/N]?y
Bump version of all packages from '3.1.4' to '3.1.5'
Could not determine base URL of SVN repository 'https://rtm-ros-robotics.googlecode.com/svn/trunk/openrtm_common'

Apparently it fails because the given URL of the repo ends with none of what's accepted by catkin_prepare_release (link to source). I'm not familiar with svn much, but the packages I'm releasing does not directly reside under trunk, and no brunch/tag is assumed to be available for the moment (I might be able to use tag though). Then what should I do with this?