ubuntu-dev-tools needs to declare dependency to dput

I try to use 'backportpackage' and run in the problem that dput isn't installed.
After installing dput backport works :-)

Successfully signed dsc and changes files
Please check tomcat7 7.0.30-0ubuntu1~precise1~ppa1 in file:///tmp/backportpackage-5a4v92 carefully!
Do you want to upload the package to ppa:dirk-computer42/c42-edge [Y|n]? Y
Traceback (most recent call last):
  File "/usr/bin/backportpackage", line 322, in <module>
    sys.exit(main(sys.argv))
  File "/usr/bin/backportpackage", line 314, in main
    opts.prompt)
  File "/usr/bin/backportpackage", line 269, in do_backport
    upload, prompt)
  File "/usr/bin/backportpackage", line 233, in do_upload
    check_call(['dput', upload, changes], cwd=workdir)
  File "/usr/bin/backportpackage", line 49, in check_call
    ret = subprocess.call(cmd, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/ubuntutools/subprocess.py", line 59, in call
    return Popen(*popenargs, **kwargs).wait()
  File "/usr/lib/python2.7/dist-packages/ubuntutools/subprocess.py", line 44, in __init__
    subprocess.Popen.__init__(self, *args, **kwargs)
  File "/usr/lib/python2.7/subprocess.py", line 679, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1249, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ubuntu-dev-tools 0.141ubuntu0.1
ProcVersionSignature: Ubuntu 3.5.0-19.30~precise1-generic 3.5.7
Uname: Linux 3.5.0-19-generic x86_64
ApportVersion: 2.0.1-0ubuntu15
Architecture: amd64
Date: Tue Dec 4 12:57:03 2012
MarkForUpload: True
PackageArchitecture: all
SourcePackage: ubuntu-dev-tools
UpgradeStatus: No upgrade log present (probably fresh install)