PHPOffice/PHPExcel — pull request #221 by nendrew (2013-07-23 12:24:30+00:00)
Title: Check whether margin-left is set in excel file when reading

I was working on Excel2007 Files when i received the following error:
Undefined index: margin-left

This change adds a simple check whether the index is set.
If it's not set everything still works just fine now.