append fails on nil

[richvdh]

Given the following in a template file:

{{ $res := slice }}
{{ $res | append nil }}

... the build will fail with an error like:

... execute of template failed: template: "partials/openapi/render-api.html" at <append nil>: error calling append: reflect: call of reflect.Value.Type on zero Value

This previously worked with Hugo v1.113.0. I suspect it was introduced by #11104.

What version of Hugo are you using (hugo version)?

v0.114.1

Does this issue reproduce with the latest release?

yes

[github-actions]

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