Don't loop forever if we can't get any data.
Don't loop forever if we can't get any data.

We all know Linux is great ... it does infinite loops in 5 seconds.
We're cross-platform though, so play nicely on the other platforms
too.

git-svn-id: 353be9ac11a1e711854a13efcc2fc17d9d6b83e7@900 c36c8488-0289-0348-9b64-b301f74bd9a7

BlueBrain/Tuvok,BlueBrain/Tuvok,BlueBrain/Tuvok