fix(editor): fix fare transfers default value

Author: landonreed

lib/editor/util/gtfs.js

@@ -102,6 +102,7 @@ export function generateNullProps (component: string): any {
     .forEach(fieldName => { props[fieldName] = null })
   if (component === 'fare') {
     props.fare_rules = []
+    props.transfers = ''
   } else if (component === 'calendar') {
     // FIXME: Need to set days of week manually (null values result in failed
     // write operation).