Do not crash if PageCursorFactory can't be created

[hannesj]

Summary

This happens eg. when forward search fails, and no search window/earliest departure time can be set.

Issue

Related to #4396

[codecov-commenter]

Codecov Report

Merging #4397 (c2f328c) into dev-2.x (0722e64) will increase coverage by 0.01%.
The diff coverage is 50.00%.

@@              Coverage Diff              @@
##             dev-2.x    #4397      +/-   ##
=============================================
+ Coverage      58.02%   58.04%   +0.01%     
- Complexity     11034    11048      +14     
=============================================
  Files           1454     1454              
  Lines          58704    58727      +23     
  Branches        6751     6760       +9     
=============================================
+ Hits           34063    34088      +25     
+ Misses         22611    22607       -4     
- Partials        2030     2032       +2     

Impacted Files	Coverage Δ
...uting/algorithm/mapping/RoutingResponseMapper.java	68.75% <0.00%> (-2.99%)	⬇️
.../opentripplanner/transit/model/timetable/Trip.java	93.54% <100.00%> (+0.32%)	⬆️
...quest/RoutingRequestTransitDataProviderFilter.java	90.00% <0.00%> (-2.50%)	⬇️
...ithm/raptoradapter/transit/TripPatternForDate.java	78.46% <0.00%> (-0.58%)	⬇️
...oradapter/transit/request/TripPatternForDates.java	77.61% <0.00%> (-0.33%)	⬇️
.../algorithm/raptoradapter/transit/TransitLayer.java	80.00% <0.00%> (ø)
...ansit/request/RaptorRoutingRequestTransitData.java	89.79% <0.00%> (ø)
.../opentripplanner/transit/raptor/util/IntUtils.java
...n/java/org/opentripplanner/util/lang/IntUtils.java	23.07% <0.00%> (ø)
...it/constrainedtransfer/TransferIndexGenerator.java	90.97% <0.00%> (+0.32%)	⬆️
... and 6 more

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