Fixed typo in exception raised by ItemTable
Fixed typo in exception raised by ItemTable

basnijholt/holoviews,vascotenner/holoviews,basnijholt/holoviews,mjabri/holoviews,vascotenner/holoviews,ioam/holoviews,basnijholt/holoviews,ioam/holoviews,mjabri/holoviews,mjabri/holoviews,vascotenner/holoviews,ioam/holoviews