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Error message in notebook when running Explicit Path graph example from User Guide

See original GitHub issue

When I take the Explicit Plot example in the graph section of the User Guide, https://bokeh.pydata.org/en/latest/docs/user_guide/graph.html, and display in a notebook I get the following message on the show(plot): E-1001 (BAD_COLUMN_NAME): Glyph refers to nonexistent column name: fill_color [renderer: GlyphRenderer(id='2ee90517-57dc-45e6-8169-288256a4d6cf', …)]

The plot still displays as expected.

ALL software version info (bokeh, python, notebook, OS, browser, any other relevant packages)

Bokeh: 0.12.9 Python: 3.6

Description of expected behavior and the observed behavior

Plot displays as it does now, but the error message does not display.

Complete, minimal, self-contained example code that reproduces the issue

import math

from bokeh.io import show, output_notebook
from bokeh.plotting import figure
from bokeh.models import GraphRenderer, StaticLayoutProvider, Oval
from bokeh.palettes import Spectral8

output_notebook()

N = 8
node_indices = list(range(N))

plot = figure(title="Graph Layout Demonstration", x_range=(-1.1,1.1), y_range=(-1.1,1.1),
              tools="", toolbar_location=None)

graph = GraphRenderer()

graph.node_renderer.data_source.data = dict(
    index=node_indices,
    fill_color=Spectral8)
graph.node_renderer.glyph = Oval(height=0.1, width=0.2, fill_color="fill_color")

graph.edge_renderer.data_source.data = dict(
    start=[0]*N,
    end=node_indices)

### start of layout code
circ = [i*2*math.pi/8 for i in node_indices]
x = [math.cos(i) for i in circ]
y = [math.sin(i) for i in circ]
graph_layout = dict(zip(node_indices, zip(x, y)))
graph.layout_provider = StaticLayoutProvider(graph_layout=graph_layout)

### Draw quadratic bezier paths
def bezier(start, end, control, steps):
    return [(1-s)**2*start + 2*(1-s)*s*control + s**2*end for s in steps]

xs, ys = [], []
sx, sy = graph_layout[0]
steps = [i/100. for i in range(100)]
for node_index in node_indices:
    ex, ey = graph_layout[node_index]
    xs.append(bezier(sx, ex, 0, steps))
    ys.append(bezier(sy, ey, 0, steps))
graph.edge_renderer.data_source.data['xs'] = xs
graph.edge_renderer.data_source.data['ys'] = ys

plot.renderers.append(graph)

show(plot)