Fix NPE in SoftButtonReplaceOperation

[JulianKast]

Fixes #1767

This PR is ready for review.

Risk

This PR makes no API changes.

Testing Plan

• I have verified that I have not introduced new warnings in this PR (or explain why below)
• I have run the unit tests with this PR
• I have tested this PR against Core and verified behavior (if applicable, if not applicable, explain why below).
• I have tested Android, Java SE, and Java EE

Core Tests

Tested changing template and adding SoftButtons at the same time in a batch update.

Core version / branch / commit hash / module tested against: generic_hmi 0.11.0
HMI name / version / branch / commit hash / module tested against: core 8.0.0

Summary

Add NPE check to softButtonReplaceOperation to check if the capability is null, as well as if the Image capability is null, and set it to false if either of those is true.

Changelog

Bug Fixes

• Add NPE check to SoftButtonReplaceOperation.supportsSoftButtonImages

CLA

• I have signed the CLA

[codecov]

Codecov Report

Merging #1772 (5f04475) into develop (423836c) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@              Coverage Diff              @@
##             develop    #1772      +/-   ##
=============================================
- Coverage      54.36%   54.36%   -0.01%     
+ Complexity      5512     5510       -2     
=============================================
  Files            562      562              
  Lines          25515    25515              
  Branches        3319     3319              
=============================================
- Hits           13872    13871       -1     
- Misses         10383    10384       +1     
  Partials        1260     1260              

Impacted Files	Coverage Δ
...nk/managers/screen/SoftButtonReplaceOperation.java	58.33% <0.00%> (-0.65%)	⬇️
...ink/managers/screen/BaseTextAndGraphicManager.java	64.16% <0.00%> (-0.42%)	⬇️
...rtdevicelink/streaming/video/SdlRemoteDisplay.java	51.21% <0.00%> (+1.21%)	⬆️

[RHenigan]

The commits from this PR were Cherry-Picked to be used as part of the 5.3.1 Hotfix release.
That PR can be found here:
#1773