Avoid showing "Processes: 0" in applications sidebar whilst loading
Showing "Processes: 0" whilst loading as it implies false information. We should never have a cgroup with no processes, so it's safe to use that as a way to query if we're loading. The use of space instead of "" is there to avoid getting a runtime warning from i18n about a missing argument. A better fix will come when the underlying model is shared, and therefore we will have all information immediately. BUG: 433326
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