clear error if s3 keys are not set for tests

services/track-changes/test/acceptance/coffee/ArchivingUpdatesTests.coffee

@@ -16,6 +16,10 @@ MockWebApi = require "./helpers/MockWebApi"
 
 describe "Archiving updates", ->
 	before (done) ->
+		if Settings?.trackchanges?.s3?.key.length < 1
+			message = "s3 keys not setup, this test setup will fail"
+			return done(message)
+
 		@now = Date.now()
 		@to = @now
 		@user_id = ObjectId().toString()