bugfix - fix for a problem appearing in Matlab2013a (thanks to Guillaume)

git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@8446 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0
automatically synchronized identical files to revision 8446

git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@8447 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0