CIF-2183 - Do not show pricing information for null values

[herzog31]

Description

• Components that display product data will no longer display prices when the GraphQL response provides null values.
• These null values have to be compliant to the GraphQL schema, for example:

 {
  "data": {
    "products": {
      "items": [
        {
          "price_range": {
            "minimum_price": {
              "final_price": {
                "currency": "USD",
                "value": null
              },
              "regular_price": {
                "currency": "USD",
                "value": null
              }
            }
          }
        }
      ]
    }
  }
}

How Has This Been Tested?

• Added unit tests
• Can be tested with https://github.com/adobe/commerce-cif-graphql-integration-reference/tree/testing/null-pricing

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 #622 (461203d) into master (6d4d2aa) will increase coverage by 0.00%.
The diff coverage is 87.50%.

@@            Coverage Diff            @@
##             master     #622   +/-   ##
=========================================
  Coverage     88.35%   88.35%           
- Complexity     1458     1463    +5     
=========================================
  Files           268      268           
  Lines          6543     6561   +18     
  Branches        985      986    +1     
=========================================
+ Hits           5781     5797   +16     
  Misses          573      573           
- Partials        189      191    +2     

Flag	Coverage Δ
integration	63.74% <31.25%> (-0.15%)	⬇️
jest	85.34% <ø> (ø)
karma	94.89% <100.00%> (+0.06%)	⬆️
unittests	88.14% <75.00%> (+0.08%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...omponents/internal/models/v1/common/PriceImpl.java	80.76% <75.00%> (-0.19%)	⬇️
...ommerce/product/v1/product/clientlib/js/product.js	97.14% <100.00%> (+0.17%)	⬆️
...oductcollection/clientlibs/js/productcollection.js	91.95% <100.00%> (+0.38%)	⬆️

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