#739 Choice-VR optional

[EggeWang]

Fixes #739

This PR is ready for review.

Risk

This PR makes no API changes.

Summary

This PR will allow app to create a choice without VrCommands.

CLA

• I have signed the CLA

[codecov-io]

Codecov Report

Merging #750 into develop will decrease coverage by 0.06%.
The diff coverage is 0%.

@@              Coverage Diff              @@
##             develop     #750      +/-   ##
=============================================
- Coverage      41.01%   40.95%   -0.07%     
  Complexity      2643     2643              
=============================================
  Files            362      362              
  Lines          15853    15857       +4     
  Branches        1695     1695              
=============================================
- Hits            6502     6494       -8     
- Misses          9044     9058      +14     
+ Partials         307      305       -2

Impacted Files	Coverage Δ	Complexity Δ
...n/java/com/smartdevicelink/proxy/SdlProxyBase.java	5.35% <0%> (-0.01%)	6 <0> (ø)
...smartdevicelink/encoder/VirtualDisplayEncoder.java	24.71% <0%> (-4.6%)	8% <0%> (ø)

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