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lsc_asc "ValueError: min() arg is an empty sequence"

The plot_lsc_asc followup is occasionally failing at both sites with the following error:

Traceback (most recent call last):
  File "build/bdist.linux-x86_64/egg/locklost/analyze.py", line 48, in analyze_event
    
  File "build/bdist.linux-x86_64/egg/locklost/plugins/lsc_asc.py", line 46, in plot_lsc_asc
    ymin, ymax = calc_ylims(refined_gps, t, buf.data, diff)
  File "build/bdist.linux-x86_64/egg/locklost/plugins/lsc_asc.py", line 92, in calc_ylims
    ymin, ymax = min(scaling_vals), max(scaling_vals)
ValueError: min() arg is an empty sequence

See e.g.:

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