Profiler panel broken when using it offline

[stof]

When using the profiler offline, the GA tracker is not available which breaks the code of the DIC panel here: https://github.com/schmittjoh/JMSDebuggingBundle/blob/master/Resources/js/app/dic_visualizer.js#L124

IMO, it should be possible to use the profiler without having access to GA as it is not the key feature.