enthought/chaco — pull request #131 by mdickinson (2013-07-03 09:55:05+00:00)
Title: Fix a KeyError from del_data introduced.

This PR fixes a `KeyError` exception raised when deleting data in Chaco; the bug was introduced in PR #124.

The PR also adds minimal tests for the `ArrayPlotData` class, including a regression test for this bug.