Fix for options undefined error. (It needed to check if the channel filter exists before trying to do something with it)

Also inverted the marker fill colors as per new UX mockup.

Closes #2300

To test, go to /analytics/dashboard/traffic and ensure the options undefined error doesn't show up in your console.

added scoped labels

changed the description

unmarked as a Work In Progress

changed title from analytics filter options undefined error to analytics filter options undefined error

changed the description

added scoped label