bugfix - ensure that single channel data AND data with nans are both working, see regression error that was reported at http://bugzilla.fcdonders.nl/show_bug.cgi?id=2364


git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@9963 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0