CIF-1314 - Product list doesn't display product without small image

[LSantha]

• fix NPE in product list when small image is missing for a product
• fix NPE in product carousel when thumbnail is missing for a product

Description

Product list component doesn't display a product if the product doesn't have a small_image (property is null) and it logs null pointer exception.
The same applied to the product carousel when a product doesn't have a thumbnail.

Related Issue

CIF-1314

How Has This Been Tested?

Unit test, manually.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes and the overall coverage did not decrease.
• All unit tests pass on CircleCi.
• I ran all tests locally and they pass.

[codecov]

Codecov Report

Merging #226 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #226      +/-   ##
============================================
+ Coverage     60.09%   60.11%   +0.01%     
- Complexity      539      541       +2     
============================================
  Files           147      147              
  Lines          4368     4370       +2     
  Branches        745      747       +2     
============================================
+ Hits           2625     2627       +2     
  Misses         1652     1652              
  Partials         91       91              

Flag	Coverage Δ	Complexity Δ
#jest	38.21% <ø> (ø)	0.00 <ø> (ø)
#karma	94.97% <ø> (ø)	0.00 <ø> (ø)
#unittests	84.90% <100.00%> (+0.01%)	541.00 <0.00> (+2.00)

Impacted Files	Coverage Δ	Complexity Δ
...models/v1/productcarousel/ProductCarouselImpl.java	87.50% <100.00%> (+0.22%)	22.00 <0.00> (+1.00)
...nternal/models/v1/productlist/ProductListImpl.java	78.43% <100.00%> (+0.21%)	34.00 <0.00> (+1.00)

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