fix #309 vertical splitter bug in IE9
fix #309 vertical splitter bug in IE9

In IE9 a vertical scrollbar can appear even in 0px width container (likely
a browser bug), this fixes that issue.

Pull request #323.

benouat/ariatemplates,ymeine/ariatemplates,fcapa/aria,fcapa/aria,divdavem/ariatemplates,lsimone/ariatemplates,fbasso/ariatemplates,fbasso/ariatemplates,lsimone/ariatemplates,ymeine/ariatemplates,simonarbuckle/ariatemplates,mlaval/ariatemplates,simonarbuckle/ariatemplates,ariatemplates/ariatemplates,vcarle/ariatemplates,flongo/ariatemplates,ymeine/ariatemplates,ariatemplates/ariatemplates,vcarle/ariatemplates,fbasso/ariatemplates,mlaval/ariatemplates,benouat/ariatemplates,simonarbuckle/ariatemplates,vcarle/ariatemplates,benouat/ariatemplates,mlaval/ariatemplates,ariatemplates/ariatemplates,fcapa/aria,divdavem/ariatemplates,divdavem/ariatemplates