Display the perf graph for the first commit of a new project

It would be nice to have patch builds for new test suites show up in patch builds. Right now there is no historic data and the server returns 404/500, causing the plugin to not display data for the commit in the patch build, which does have perf data.

With google benchmarks, tasks will be added on a more regular bases so it would be nice to provide a better experience for developers.

See this patch build as an example.