Jenkins doc job error: rosdep thriftpy

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I have this error in the Jenkins doc job of my package: http://build.ros.org/view/Mdoc/job/Md...

04:09:39 /tmp/ws/src/z_laser_projector/doc/zlp_core.rst:4: WARNING: autodoc: failed to import module u'zlp_core'; the following exception was raised:
04:09:39 Traceback (most recent call last):
04:09:39   File "/usr/lib/python2.7/dist-packages/sphinx/ext/autodoc.py", line 658, in import_object
04:09:39     __import__(self.modname)
04:09:39   File "/tmp/ws/src/z_laser_projector/src/z_laser_projector/zlp_core.py", line 29, in <module>
04:09:39     import thriftpy
04:09:39 ImportError: No module named thriftpy

I'm trying to solve it including dependencies in my package.xml:

  <build_depend>python3-thriftpy</build_depend>
  <build_export_depend>python3-thriftpy</build_export_depend>
  <exec_depend>python3-thriftpy</exec_depend>

However, when I try to build the package at Travis-CI (in private before try in Jenkins), it throws this error:

ERROR: the following packages/stacks could not have their rosdep keys resolved
to system dependencies:
z_laser_projector: Cannot locate rosdep definition for [python3-thriftpy]
The command "rosdep install -y --from-paths src --ignore-src --rosdistro $ROS_DISTRO" failed and exited with 1 during .

How could I include this dependency in order to fix the Jenkins job? Am I taking the right way to solve the error?