--- /dev/null
+---
+fixes:
+ - |
+ Fix error with handling unbound arrays for search extensions, when using
+ `set -u`. The correct way of using this.
+
+ .. code-block:: bash
+
+ set -u
+ arr=()
+ echo "output: '${arr[@]}'"
+ bash: arr[@]: unbound variable
+ echo "output: '${arr[@]:-}'"
+ foo: ''