if (c_none or
                co is not None or
                isinstance(c, str) or
                (isinstance(c, collections.Iterable) and 
                    len(c) > 0 and # proposed fix here
                    isinstance(c[0], str))):

IndexError                                Traceback (most recent call last)
<ipython-input-5-0368a082f6a8> in <module>
----> 1 sns.swarmplot('category', 'values', hue='hue', data=df, dodge=True)

h:\anaconda3\lib\site-packages\seaborn\categorical.py in swarmplot(x, y, hue, data, order, hue_order, dodge, orient, color, palette, size, edgecolor, linewidth, ax, **kwargs)
   2989                        linewidth=linewidth))
   2990 
-> 2991     plotter.plot(ax, kwargs)
   2992     return ax
   2993 

h:\anaconda3\lib\site-packages\seaborn\categorical.py in plot(self, ax, kws)
   1444     def plot(self, ax, kws):
   1445         """Make the full plot."""
-> 1446         self.draw_swarmplot(ax, kws)
   1447         self.add_legend_data(ax)
   1448         self.annotate_axes(ax)

h:\anaconda3\lib\site-packages\seaborn\categorical.py in draw_swarmplot(self, ax, kws)
   1429                     kws.update(c=point_colors)
   1430                     if self.orient == "v":
-> 1431                         points = ax.scatter(cat_pos, swarm_data, s=s, **kws)
   1432                     else:
   1433                         points = ax.scatter(swarm_data, cat_pos, s=s, **kws)

h:\anaconda3\lib\site-packages\matplotlib\__init__.py in inner(ax, data, *args, **kwargs)
   1803                         "the Matplotlib list!)" % (label_namer, func.__name__),
   1804                         RuntimeWarning, stacklevel=2)
-> 1805             return func(ax, *args, **kwargs)
   1806 
   1807         inner.__doc__ = _add_data_doc(inner.__doc__,

h:\anaconda3\lib\site-packages\matplotlib\axes\_axes.py in scatter(self, x, y, s, c, marker, cmap, norm, vmin, vmax, alpha, linewidths, verts, edgecolors, **kwargs)
   4194                 (isinstance(c, collections.Iterable) and
   4195                     # len(c) > 0 and
-> 4196                     isinstance(c[0], str))):
   4197             c_array = None
   4198         else:

IndexError: index 0 is out of bounds for axis 0 with size 0