merge2: fix duplicate test case

[phooijenga]

The remove scalar -- empty in src test case was identical to the remove scalar -- null in src case.

[linux-foundation-easycla]

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[natasha41575]

/ok-to-test

[stormqueen1990]

/cc

[stormqueen1990]

Looks good to me -- it seems the test previously repeated the null case instead of having an empty field and this change looks correct. Tests are also passing as expected.

/lgtm

[koba1t]

Thanks for your contribution!
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: koba1t, phooijenga

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