NoneType error in mixed HCV pipeline

[donkirkby]

The 08-Mar-2019.M04401 run contained two samples: NEG-1_HCV and NEG-2_MidHCV. Because these didn't follow the naming convention for whole-genome and MIDI sample pairs, NEG-1 did not have a MIDI partner. When I tried to run the MiCall watcher with the Mixed HCV pipeline enabled, it failed with this error:

2019-03-15 14:56:57[ERROR]micall.monitor.kive_watcher.wait_for_retry(): Waiting 0:00:05 before retrying.
Traceback (most recent call last):
  File "/mnt/data/don/git/MiCall/micall/monitor/sample_watcher.py", line 92, in poll_runs
    is_finished = self.poll_sample_runs(sample_watcher)
  File "/mnt/data/don/git/MiCall/micall/monitor/sample_watcher.py", line 131, in poll_sample_runs
    for run in (mixed_hcv_run, mixed_hcv_midi_run)
  File "/mnt/data/don/git/MiCall/micall/monitor/sample_watcher.py", line 132, in <listcomp>
    if run['id'] in self.active_runs and not self.fetch_run_status(run)]
TypeError: 'NoneType' object is not subscriptable

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/mnt/data/don/git/MiCall/micall/monitor/kive_watcher.py", line 422, in poll_runs
    folder_watcher.poll_runs()
  File "/mnt/data/don/git/MiCall/micall/monitor/sample_watcher.py", line 96, in poll_runs
    f'failed.') from ex
RuntimeError: Polling sample group NEG-1 failed.