Closes #8095

Per testing and documentation the if guard to check if a slice is not
empty or not nil is not necessary.

Documentation:

> {{range pipeline}} T1 {{end}}
>	The value of the pipeline must be an array, slice, map, iter.Seq,
>	iter.Seq2, integer or channel.
>	If the value of the pipeline has length zero, nothing is output;
>	otherwise, dot is set to the successive elements of the array,
>	slice, or map and T1 is executed. If the value is a map and the
>	keys are of basic type with a defined order, the elements will be
>	visited in sorted key order.

https://pkg.go.dev/text/template#hdr-Actions

Code testing:

```
<p>begin</p>
{{ range $value := .Elements }}
    <p>{{ $value }}</p>
{{ end }}
<p>end</p>
```

struct that gets populated with data:
```
type Example struct {
    Elements []string
}
```

executed with the following data:
```
// slice is not empty
e := Example{
    Elements: []string{"one", "two", "three"}
}

// slice is empty, but initialised
eEmpty := Example {
    Elements: []string{}
}

// slice is nil
eNil := Example {
    Elements: nil
}
```

The output for these three in order:
```
<p>begin</p>

    <p>Element 1</p>

    <p>Element 2</p>

    <p>Element 3</p>

<p>end</p>
<p>begin</p>

<p>end</p>
<p>begin</p>

<p>end</p>
```