ugBufferSize: handle empty grid view
When distributing a grid over too many processes, some processes might
end up having no elements at all. These processes also do not need to
communicate, so returning a size of 0 is okay.
Closes: #112 (closed)
When distributing a grid over too many processes, some processes might
end up having no elements at all. These processes also do not need to
communicate, so returning a size of 0 is okay.
Closes: #112 (closed)