`summarycombine` error when no PSD in metafile
The purpose of this MR is to fix an error which occurs when you run summarycombine
on a metafile which does not have any PSDs stored. Fixes issue #189 (closed).
The purpose of this MR is to fix an error which occurs when you run summarycombine
on a metafile which does not have any PSDs stored. Fixes issue #189 (closed).