PHPOffice/PHPExcel — pull request #63 by alexgann (2012-10-19 16:38:59+00:00)
Title: Fix to cellExists for non-existent namedRanges

Found an issue where cellExists was failing on a non-existent namedRange
as it was flowing down to the coordinateFromString (1217) call. Proposed
change trusts the REGEXP check and if $namedRange == NULL after all
then simply return false (ie the cell does not exist).