lib5c dd-curve crashes when plotting only one rep

seems related to the creation of the legend within seaborn but I have not spent any time tracing it

here's the command and resulting stack trace:

(clean-venv)[tgg@node107 comparison-manuscript]$ lib5c dd-curve -p bedfiles/4kb_bins.bed -R test/%r.png cqn/jointexpress/bin_16_4/pNPC2_binned.counts
loading counts
encountered exception, falling back to series operation
Traceback (most recent call last):
  File "/home/tgg/clean-venv/bin/lib5c", line 9, in <module>
    load_entry_point('lib5c==0.4.3-alpha.5', 'console_scripts', 'lib5c')()
  File "/home/tgg/clean-venv/lib/python2.7/site-packages/lib5c/tools/lib5c_toolbox.py", line 100, in lib5c_toolbox
    args.func(root_parser, args)
  File "/home/tgg/clean-venv/lib/python2.7/site-packages/lib5c/tools/dd_curve.py", line 120, in dd_curve_tool
    plot_kwargs={'ylim': ylim},
  File "<decorator-gen-5>", line 2, in plot_distance_dependence
  File "/home/tgg/clean-venv/lib/python2.7/site-packages/lib5c/util/parallelization.py", line 140, in parallel_func
    results = map(wrapped_function, args_list)
  File "/home/tgg/clean-venv/lib/python2.7/site-packages/lib5c/util/parallelization.py", line 98, in wrapped_function
    return f(*args)
  File "/home/tgg/clean-venv/lib/python2.7/site-packages/lib5c/plotters/distance_dependence.py", line 107, in plot_distance_dependence
    data=joined, ci=None, palette=palette, hue_order=hue_order)
  File "/home/tgg/clean-venv/lib/python2.7/site-packages/seaborn/categorical.py", line 3016, in pointplot
    plotter.plot(ax)
  File "/home/tgg/clean-venv/lib/python2.7/site-packages/seaborn/categorical.py", line 1696, in plot
    self.annotate_axes(ax)
  File "/home/tgg/clean-venv/lib/python2.7/site-packages/seaborn/categorical.py", line 395, in annotate_axes
    leg.set_title(self.hue_title)
AttributeError: 'NoneType' object has no attribute 'set_title'

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