randym/axlsx — pull request #155 by nilbus (2013-01-03 00:19:20+00:00)
Title: Fixes related to validating worksheet name uniqueness

0523e90 (Edward Anderson, 5 minutes ago)
Worksheet name uniqueness doesn't apply to itself

This constraint would prevent you from creating a new worksheet with the
name that it would have gotten by default.

cac5b8a (Edward Anderson, 33 minutes ago)
Don't add worksheets to the workbook when initialize fails

Creating a worksheet with an invalid name would still add it to the
workbook, despite raising an exception.