SonarQube - Dodgy: Redundant nullcheck of value known to be non-null

There is a need to fix Sonar issues.
Rule name for this ticket is "Redundant nullcheck of value known to be non-null"
Link to the Sonar issues site:
https://ci-stg.openmrs.org/sonar/drilldown/issues/org.openmrs:openmrs?&rule=findbugs%3ARCN_REDUNDANT_NULLCHECK_OF_NONNULL_VALUE&rule_sev=CRITICAL&severity=CRITICAL