CIF-2223 - Productlist item shows placeholder image and image at the same time

[LSantha]

Display placeholder image only if the product has no image.

Related Issue

CIF-2223

How Has This Been Tested?

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 #631 (0fd658b) into master (6199b65) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #631   +/-   ##
=========================================
  Coverage     87.99%   87.99%           
  Complexity     1565     1565           
=========================================
  Files           280      280           
  Lines          6907     6907           
  Branches       1030     1030           
=========================================
  Hits           6078     6078           
  Misses          624      624           
  Partials        205      205           

Flag	Coverage Δ
integration	59.68% <ø> (ø)
jest	85.61% <ø> (ø)
karma	89.05% <ø> (ø)
unittests	88.32% <ø> (ø)

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