Check OTP plan object from response

[binh-dam-ibigroup]

Observed behavior

NullPointerExceptions are thrown by OTP Middleware at CheckMonitoredTrip#makeOTPRequestAndUpdateMatchingItinerary when OTP does not find a plan for a MonitoredTrip for which a plan was found in the past.

This may happen when approaching holidays when trips that normally happen are removed from the schedule for specific days.

Expected behavior

No null pointer exceptions should be thrown in such situations.

Steps to reproduce the problem

Using FDOT and Friday, Jan. 1, 2021 as an example:

• Create a weekday itinerary that involves SunRail, and monitor Friday only. (SunRail does not operate on holidays)
• During the week leading to the holiday, run the CheckMonitoredTrip job
• A NullPointerException occurs at the beginning of the for loop in CheckMonitoredTrip#makeOTPRequestAndUpdateMatchingItinerary

Any special notes on configuration used

No special config used.

Version of otp-middleware and/or OpenTripPlanner if applicable (exact commit hash or branch name)

Latest dev branch.