color_discrete_map in px.pie() should require color argument

Modified example from tutorial :

df = px.data.tips()
fig = px.pie(df, values='tip', names='day',
             color_discrete_map={'Thur':'lightcyan',
                                 'Fri':'cyan',
                                 'Sat':'royalblue',
                                 'Sun':'darkblue'})
fig.show()

will not color the pie chart according to values specified in color_discrete_map. If the variable is not used in any way (unless I'm unaware of some hidden mechanism), user should be notified with a warning or an error that 'color_discrete_map' will not be used because 'color' argument was not specified.

Start by reproducing the tutorial example through the px.pie() entry point, with color_discrete_map supplied but no color argument. Trace how these arguments are handled and determine whether the completed behavior should warn or error when the map cannot be used; done means the case no longer fails silently.