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This is because your rosdep sources are out of date. rosdep has an entry in its sources list for each gbpdistro file for each ROS distribution. hydro has recently been added to the list:
https://github.com/ros/rosdistro/commit/c09e4ae3ff3e8e81408127582c4b260718c679f6
So to solve this, remove your /etc/ros/rosdep/sources.list.d/20-default.list file and do sudo rosdep init and rosdep update OR add the line from the above commit to your /etc/ros/rosdep/sources.list.d/20-default.list file directly and then do rosdep update.
I know this is a likely pitfall for most users, but the method for tools like rosdep to get this information will be improved with the new rosdistro format being drafted in REP137:
https://github.com/ros-infrastructure/rep/pull/27
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