CIF-1189 - Misc issues with "related products" component

[cjelger]

• fixed NPE in sling model
• fixed css when the screen is very wide
• remove "no products to display" placeholder in publish mode

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:

• 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 #178 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #178   +/-   ##
=========================================
  Coverage     57.88%   57.88%           
  Complexity      474      474           
=========================================
  Files           148      148           
  Lines          4184     4184           
  Branches        719      719           
=========================================
  Hits           2422     2422           
  Misses         1669     1669           
  Partials         93       93

Flag	Coverage Δ	Complexity Δ
#jest	37.56% <ø> (ø)	0 <ø> (ø)	⬇️
#karma	94.53% <ø> (ø)	0 <ø> (ø)	⬇️
#unittests	82.54% <ø> (ø)	474 <ø> (ø)	⬇️

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