Undetermined behavior for steps that were not yet executed

[flosell]

If a step wasn't executed yet, the cctray.xml shows undetermined data:

<Projects>
<Project name="some sample pipeline :: some-slow-step" activity="Building" lastBuildStatus="Unknown" lastBuildLabel="1" lastBuildTime="2016-11-30T15:09:45.881Z" webUrl="http://localhost:8081/pipeline/#/builds/1/1"/>
<Project name="some sample pipeline :: wait-for-interaction" activity="" lastBuildStatus="Unknown" lastBuildLabel="" lastBuildTime="2016-11-30T15:09:47.411Z" webUrl="http://localhost:8081/pipeline/#/builds//2"/>
<Project name="some sample pipeline :: either" activity="" lastBuildStatus="Unknown" lastBuildLabel="" lastBuildTime="2016-11-30T15:09:47.412Z" webUrl="http://localhost:8081/pipeline/#/builds//3"/>
<Project name="some sample pipeline :: some-failing-step" activity="" lastBuildStatus="Unknown" lastBuildLabel="" lastBuildTime="2016-11-30T15:09:47.412Z" webUrl="http://localhost:8081/pipeline/#/builds//1-3"/>
<Project name="some sample pipeline :: some-successful-step" activity="" lastBuildStatus="Unknown" lastBuildLabel="" lastBuildTime="2016-11-30T15:09:47.412Z" webUrl="http://localhost:8081/pipeline/#/builds//2-3"/>
</Projects>

Notice the last build time is just the current time, lastBuildLabel and activity are empty strings and the web-url does not contain a build-number.
Instead, we should aim something that gives users at least some value, i.e. a build that hasn't been running yet is probably sleeping, we can point to the url of the most recent build, ...