Polygon with no points causes javascript error

[captain-igloo]

• [*] I've looked at the documentation to make sure the behavior is documented and expected
• [*] I'm sure this is a Leaflet code issue, not an issue with my own code nor with the framework I'm using (Cordova, Ionic, Angular, React…)
• [*] I've searched through the issues to make sure it's not yet reported

Steps to reproduce

1. create a polygon with no points
2. add it to the map
3. call setStyle({weight: 1})

See https://jsfiddle.net/q5x3bsy0/

Expected behavior
I expect no javascript error. There is no error with leaflet 1.4.0.

Current behavior
This results in a javascript error: "Cannot read property 'min' of undefined"

Environment

• Leaflet version:1.5.1
• Browser (with version): Chromium 73
• OS/Platform (with version): Ubuntu Linux 18.04

Additional context
Possibly a duplicate of #6662

Minimal example reproducing the issue

var mymap = L.map('map');
var polygon = L.polygon([]);
polygon.addTo(mymap);
polygon.setStyle({
	weight: 1
});

Please create an example using https://leafletjs.com/edit.html or any other jsfiddle-like site.
https://jsfiddle.net/q5x3bsy0/

• [*] this example is as simple as possible
• [*] this example does not rely on any third party code

[opoto]

Same issue here.
The proposed fix from #6662 solves it on my side.