Charts don't show functions which have not been called yet

[nigeldeakin]

The dynamic charts of queued/running/completed/failed do not show functions that have not been called. The first time a function is called a new line is added to each chart and legend.

This is not what the user would expect. If a function has been created then it should be added to the chart, even if it has never been called. Obviously queued/running/completed/failed would be zero, but it would appear in the legend.

The root cause is that this is the behaviour of the /stats API call in the fn server. See fnproject/fn#368