Fix grva008

Author: T4rk1n

components/dash-core-components/tests/integration/graph/test_graph_varia.py

@@ -714,6 +714,7 @@ def test_grva008_shapes_not_lost(dash_dcc):
     dash_dcc.start_server(app)
     button = dash_dcc.wait_for_element("#button")
     dash_dcc.wait_for_text_to_equal("#output", "0")
+    dash_dcc.wait_for_element("#graph .js-plotly-plot")
 
     # Draw a shape
     dash_dcc.click_and_hold_at_coord_fractions("#graph", 0.25, 0.25)