fix(editor): fix new calendar writes

lib/editor/util/gtfs.js

@@ -102,6 +102,16 @@ export function generateNullProps (component: string): any {
     .forEach(fieldName => { props[fieldName] = null })
   if (component === 'fare') {
     props.fare_rules = []
+  } else if (component === 'calendar') {
+    // FIXME: Need to set days of week manually (null values result in failed
+    // write operation).
+    props.monday = 0
+    props.tuesday = 0
+    props.wednesday = 0
+    props.thursday = 0
+    props.friday = 0
+    props.saturday = 0
+    props.sunday = 0
   }
   return props
 }