Fix the list -s command when result_dep is used.

[saimn]

The tasks dict was not passed to get_status when using doit list --all -s mytask

Traceback (most recent call last):
  File "/home/conseil/lib/doit/doit/doit_cmd.py", line 175, in run
    return command.parse_execute(args)
  File "/home/conseil/lib/doit/doit/cmd_base.py", line 111, in parse_execute
    return self.execute(params, args)
  File "/home/conseil/lib/doit/doit/cmd_base.py", line 352, in execute
    return self._execute(**exec_params)
  File "/home/conseil/lib/doit/doit/cmd_list.py", line 149, in _execute
    self._print_task(template, task, status, list_deps)
  File "/home/conseil/lib/doit/doit/cmd_list.py", line 80, in _print_task
    task_status = self.dep_manager.get_status(task, None)
  File "/home/conseil/lib/doit/doit/dependency.py", line 576, in get_status
    uptodate_result = utd(*args, **utd_kwargs)
  File "/home/conseil/lib/doit/doit/task.py", line 537, in __call__
    dep_task = self.tasks_dict[self.dep_name]
TypeError: 'NoneType' object has no attribute '__getitem__'

[coveralls]

Coverage increased (+0.0%) to 99.76% when pulling 8edb5b3 on saimn:list-result-dep into 0ebdfa3 on pydoit:master.

[coveralls]

Coverage increased (+0.0%) to 99.76% when pulling fd4ae8f on saimn:list-result-dep into 0ebdfa3 on pydoit:master.

[schettino72]

Thanks. This is merged now.

I did not use your tests because I dont want to let "sample_tasks" grow more since it affects many tests. It is ok to use only on very basic tests...