Remove obsolete code that caused the PR tab to refresh when pressing "Show More"

[NicuPascu]

Description

Found some obsolete code that caused the render function to "return null" once every time when getting the next items before re-rendering

See JENKINS-47460.

Submitter checklist

• Link to JIRA ticket in description, if appropriate.
• Change is code complete and matches issue description
• Appropriate unit or acceptance tests or explanation to why this change has no tests
• Reviewer's manual test instructions provided in PR description. See Reviewer's first task below.

Reviewer checklist

• Run the changes and verified the change matches the issue description
• Reviewed the code
• Verified that the appropriate tests have been written or valid explanation given

[NicuPascu]

Before:

After:

[NicuPascu]

Given the fact that this bug was caused by some rogue piece of code that was left over from the Redux time I do not think any test is necessary

[sophistifunk]

[michaelneale]

LGTM