Refs #9403 Save Workspaces dialog can now be opened offline

The Save workspaces dialog can now be opened under all the following circumstances, whereas before it would raise an exception and not show:

* The workstation is not connected to a network or loses it's connection to a network
* The archives aren't available or aren't mounted
* A config.xml file isn't in place or doesn't contain a mount point location
Merge branch 'feature/9403_Refl_Offline_Save_Workspaces' into develop