Latest power plot has error when data produces out-of-bound lightness

[nhoening]

File "/home/seita/.virtualenvs/seita-flexmeasures/lib/python3.8/site-packages/flexmeasures/ui/crud/assets.py", line 208, in get
   latest_measurement_time_str, asset_plot_html = get_latest_power_as_plot(asset)
 File "/home/seita/.virtualenvs/seita-flexmeasures/lib/python3.8/site-packages/flexmeasures/ui/utils/plotting_utils.py", line 617, in get_latest_power_as_plot
   % Color(
 File "/home/seita/.virtualenvs/seita-flexmeasures/lib/python3.8/site-packages/colour.py", line 1021, in get_hex_l
   return rgb2hex(self.rgb, force_long=True)
 File "/home/seita/.virtualenvs/seita-flexmeasures/lib/python3.8/site-packages/colour.py", line 999, in __getattr__
   return getattr(self, 'get_' + label)()
 File "/home/seita/.virtualenvs/seita-flexmeasures/lib/python3.8/site-packages/colour.py", line 1024, in get_rgb
   return hsl2rgb(self.hsl)
 File "/home/seita/.virtualenvs/seita-flexmeasures/lib/python3.8/site-packages/colour.py", line 351, in hsl2rgb
   raise ValueError("Lightness must be between 0 and 1.")
ValueError: Lightness must be between 0 and 1.