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.

首先通过 px.pie() 入口复现教程示例，提供 color_discrete_map，但不提供 color 参数。跟踪这些参数的处理方式，并确定当无法使用该 map 时，完成后的行为应当发出警告还是报错；完成的标准是该情况不再静默失败。