SELC-4686 fix: changed check on taxCode null in getInstitutions method

[empassaro]

List of Changes

changed check on taxCode null in getInstitutions method

Motivation and Context

improved check using StringUtils.isNotBlank to handle taxCode empty

How Has This Been Tested?

Screenshots (if appropriate):

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 not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[sonarqubecloud]

Quality Gate failed

Failed conditions
E Maintainability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

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