Added check for legs to route refresh

[devotaaabel]

Description

Fixed NPE reported by customer.

• I have added any issue links
• I have added all related labels (bug, feature, new API(s), SEMVER, etc.)
• I have added the appropriate milestone and project boards

Goal

The directions refresh API now sends no legs when the map matching request fails. This PR accounts for those responses.

Implementation

This was fixed with a null check.

Testing

• I have tested locally (including SNAPSHOT upstream dependencies if needed)
• I have tested via a test drive, or a simulation/mock location app
• New and existing unit tests pass locally with my changes

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code

[danesfeder]

@devotaaabel thanks for running with this fix. Can we add a unit test for the new condition as well? Thanks!

[codecov-io]

Codecov Report

Merging #1916 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #1916      +/-   ##
============================================
+ Coverage      36.3%   36.35%   +0.04%     
- Complexity     1086     1090       +4     
============================================
  Files           261      261              
  Lines          8874     8874              
  Branches        668      668              
============================================
+ Hits           3222     3226       +4     
+ Misses         5361     5357       -4     
  Partials        291      291

[danesfeder]

Thanks for addressing the feedback @devotaaabel 🚢