Empty features

[damiles]

If an empty geojson is added with empty features like:

{"type":"FeatureCollection","features":[]}

an error is reach:

    566         they are functions returning dictionaries.
    567         """
--> 568         test_feature = self.data['features'][0]
    569         if not callable(func) or not isinstance(func(test_feature), dict):
    570             raise ValueError('{} should be a function that accepts items from '

IndexError: list index out of range

A simple check will avoid this issue.

folium/folium/features.py

Line 571 in ab77557

test_feature = self.data['features'][0]

[Conengmo]

Looks like currently an empty features is not allowed. I don't see the point of allowing those. The error message could be better though.

[Conengmo]

This was fixed in #1213. And this issue is a duplicate of #1212.