debootstrap: Alert missing qemu in script

debootstrap/script-raspbian

@@ -20,7 +20,7 @@ esac
 work_out_debs () {
 	required="$(get_debs Priority: required)"
 
-    # remove some packages for Docker
+	# remove some packages for Docker
 	required="$(without "$required" "$ignore_packages")"
 
 	if doing_variant - || doing_variant fakechroot; then
@@ -39,7 +39,7 @@ work_out_debs () {
 	fi
 
 	case $MIRRORS in
-	    https://*)
+		https://*)
 		base="$base apt-transport-https ca-certificates"
 		;;
 	esac
@@ -74,6 +74,9 @@ second_stage_install () {
 
 	if [ -x /usr/bin/qemu-arm-static ]; then
 		cp -a /usr/bin/qemu-arm-static "$TARGET/usr/bin/qemu-arm-static"
+	else
+		echo "No qemu-arm-static found!" >&2
+		exit 1
 	fi
 
 	x_feign_install () {