fix(editor): fix trip writes for non-frequency based trips

Author: landonreed

lib/editor/components/timetable/TimetableEditor.js

@@ -109,6 +109,10 @@ export default class TimetableEditor extends Component {
       // If a frequency-based trip, never use exact times. NOTE: there is no
       // column to edit this field in the timetable grid.
       objectPath.set(newRow, 'frequencies.0.exactTimes', 0)
+    } else {
+      // If not using frequencies, set frequencies to empty array so that SQL backend
+      // is happy.
+      objectPath.set(newRow, 'frequencies', [])
     }
     objectPath.set(newRow, 'feedId', this.props.feedSource.id)
     objectPath.set(newRow, 'patternId', activePattern.patternId)