A collection of minor changes to idle view: - Fix node total calculation - Small formatting changes - Sanity check is now a flag that the expt was used since latest slothd update - Special case for idle expts without any PCs. Since we expect that they   won't be giving any slothd reports, just ignore them here.
A collection of minor changes to idle view:
- Fix node total calculation
- Small formatting changes
- Sanity check is now a flag that the expt was used since latest slothd update
- Special case for idle expts without any PCs. Since we expect that they
  won't be giving any slothd reports, just ignore them here.

nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome