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Thomas De Schampheleire
pullrequests: don't show empty "additional changesets" (issue #280)

When opening a pullrequest on a revision range including the tipmost
revision, and then pushing a new revision on top of that, the PR page shows:
This pullrequest can be updated with changes on ...:
and then nothing.

This is because the available revisions looped over are in 'avail_cs' but
the guard around the loop is checking on 'avail_revs'. The former, while
derived from avail_revs, can become empty under circumstances like this one.

Fix the problem by changing the guard checking avail_cs rather than
avail_revs, and making sure the printed message is aligned to 'No additional
changes found'.
.. _debugging:

===================
Debugging Kallithea
===================

If you encounter problems with Kallithea, here are some instructions
on how to debug them.

.. note:: First make sure you're using the latest version available.


Enable detailed debug
---------------------

Kallithea uses the standard Python ``logging`` module to log its output.
By default only loggers with ``INFO`` level are displayed. To enable full output
change ``level = DEBUG`` for all logging handlers in the currently used .ini file.
This change will allow you to see much more detailed output in the log file or
console. This generally helps a lot to track issues.


Enable interactive debug mode
-----------------------------

To enable interactive debug mode simply comment out ``set debug = false`` in
the .ini file. This will trigger an interactive debugger each time
there is an error in the browser, or send a http link if an error occurred in the backend. This
is a great tool for fast debugging as you get a handy Python console right
in the web view.

.. warning:: NEVER ENABLE THIS ON PRODUCTION! The interactive console
             can be a serious security threat to your system.