Fix potential panic in `ls` (#14655) #627

Job	Run time
build-wasm	2m 13s
plugins (windows-latest)	13m 13s
fmt-clippy (windows-latest)	8m 38s
plugins (macos-13)	10m 42s
std-lib-and-python-virtualenv (ubuntu-20.04, py)	4m 6s
fmt-clippy (macos-13)	5m 37s
plugins (ubuntu-20.04)	5m 32s
tests (windows-latest)	7m 46s
std-lib-and-python-virtualenv (macos-latest, py)	4m 15s
fmt-clippy (ubuntu-20.04)	3m 4s
tests (macos-latest)	5m 24s
std-lib-and-python-virtualenv (windows-latest, py)	11m 28s
tests (ubuntu-20.04)	6m 17s
	1h 28m 15s

Provide feedback