plugins/jump: use `_command_exists`

Addresses bash-it/bash-it#1632

clean_files.txt

@@ -86,6 +86,7 @@ plugins/available/goenv.plugin.bash
 plugins/available/history-search.plugin.bash
 plugins/available/history-substring-search.plugin.bash
 plugins/available/history.plugin.bash
+plugins/available/jump.plugin.bash
 plugins/available/node.plugin.bash
 plugins/available/textmate.plugin.bash
 plugins/available/xterm.plugin.bash

plugins/available/jump.plugin.bash

@@ -1,9 +1,12 @@
+# shellcheck shell=bash
+# shellcheck disable=SC2016
 cite about-plugin
 about-plugin 'initialize jump (see https://github.com/gsamokovarov/jump). Add `export JUMP_OPTS=("--bind=z")` to change keybinding'
 
-__init_jump() {
-  command -v jump &> /dev/null || return
-  eval "$(jump shell bash "${JUMP_OPTS[@]}")"
+function __init_jump() {
+	if _command_exists jump; then
+		eval "$(jump shell bash "${JUMP_OPTS[@]}")"
+	fi
 }
 
 __init_jump