Fixed bug in HoloMap.split_overlay where keys were not being returned
Fixed bug in HoloMap.split_overlay where keys were not being returned

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