trailheads not showing up in edit trip

[ryanbranciforte]

when you try to edit some trips, the trailheads in the map show up fine:

http://www.transitandtrails.org/trips/11

but when you try and edit other trips, the trailheads and start and end trailhead are missing:

http://www.transitandtrails.org/trips/224

i am trying to clean up some line work on some trips and can't do without having the start/end trailheads visible

[jmoe]

Pushed a fix for this, please verify and close.

[ryanbranciforte]

Looks good.