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lisa.analysis.tasks: Catch empty task_state df's

Darryl Green requested to merge github/fork/valschneider/analysis/plot_tasks_slice into master

Created by: valschneider

Running trace.analysis.plot_tasks_activation() on a recent integration trace yields:

  lisa/lisa/analysis/tasks.py in df_task_states(self, task, stringify)
      459         """
      460         tasks_df = list(self._df_tasks_states(tasks=[task]))
  --> 461         task_id, task_df = tasks_df[0]
      462         task_df = task_df.drop(columns=["pid", "comm"])
      463
  IndexError: list index out of range

It turns out that the task causing this exception is present in the trace, and has associated sched_switch / sched_wakeup events, but is eclipsed by the TraceView slice done on the downstream TestBundle.

Catch empty state df's in df_task_states(). Silently skip unplottable tasks in plot_tasks_activation().

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