nds-1 servers within CDS having problems reading unsigned-32bit integer channels from frame

Migrated from CDS bugzilla (https://bugzilla.ligo-wa.caltech.edu/bugzilla3/show_bug.cgi?id=1116) and FRS (https://services.ligo-la.caltech.edu/FRS/show_bug.cgi?id=6705)

When we ask for any unsigned-32bit integer channels (datatype=7) from the full 64 second frames, the nds1 servers do not return any data. The second and minute trends derived from these data however are available.