Removed `Debugger("no slices")'.  It's normal and harmless to have no slices in sd_open() after a media change when the previous sd_open() discards the previous slices and then fails.  sd_open() just handles media changes poorly and fails too often.
Removed `Debugger("no slices")'.  It's normal and harmless to have no
slices in sd_open() after a media change when the previous sd_open()
discards the previous slices and then fails.  sd_open() just handles
media changes poorly and fails too often.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase