BUG: UnboundLocalError when missing_kwds is used

[martinfleis]

I'm afraid the issue isn't completely solved yet. Still (0.9.0, 0.10.2) getting the following error

however, if I apply your fix a second time a little later in the code like this

it plots as expected – should you need a testcase pls let me know and thanks so far

Originally posted by @wahlatlas in #1600 (comment)

[wahlatlas]

Would this be of any help as a testcase
https://nbviewer.org/urls/wahlatlas.net/btw/21/geopandas.ipynb
or would you need a more reduced case with english comments?

[wahlatlas]

Maybe some complete sentence on the issue:
The missing_kwds defines how missing data should be styled on the plotted map and does this just fine. However if such definition is present but there happens to be no missing data, the mentioned UnboundLocalError will occur. In the above example this comes up as the plot command is used with various data columns, some of which happen to have missing data, others not (in this case smaller parties that weren't eligible in the whole country).

[jdmcbr]

A reproducible example:

import geopandas as gpd
world = gpd.read_file(gpd.datasets.get_path("naturalearth_lowres"))
world.plot(column="continent", legend=True, missing_kwds={"facecolor": "none"})