NullPointer exception on view reset and simulataneous removal of feature

[spamdaemon]

I got this error while zooming out in my application:

Uncaught TypeError: Cannot call method 'latLngToLayerPoint' of null leaflet-src.js:4842
L.Polyline.L.Path.extend.projectLatlngs leaflet-src.js:4842
L.Polygon.L.Polyline.extend.projectLatlngs leaflet-src.js:5069
L.Mixin.Events.fireEvent leaflet-src.js:389
L.Map.L.Class.extend._resetView leaflet-src.js:1843
L.Map.include.setView leaflet-src.js:7949
L.Map.ScrollWheelZoom.L.Handler.extend._performZoom leaflet-src.js:6220
(anonymous function)

I believe this is caused by me removing features that have become too small to be visible. I do this removal in the view-reset or zoom-end, which ever hits first.

I guess what's happening is this sequence:

1. viewreset event is fired
   1.1 get all listeners for this event
   1.2 start firing events
   1.2.1 my map listeners notices that zoom is too low, so remove a feature which is in the list of listeners (1.1) and set it's _map to null
   1.2.2 listener the feature that's been removed is called with its map set to null.

Using leaflet 0.5.1

[spamdaemon]

Easy way to fix this seems to be to add a small piece of code when removing a listener:

listeners.splice(j, 1)[0].action = function(){};

[mourner]

@spamdaemon does it behave the same in Leaflet master?

[spamdaemon]

Created a pull request for you : #1656