Allow jump plugin to fail silently when jump not installed

Per recommendations from @nwinkler, allow the jump test to fail
silently. This helps in cases where users are SSH'ing in, or for some
other reason are using bash-it environment on a foreign machine.

plugins/available/jump.plugin.bash

@@ -2,13 +2,8 @@ cite about-plugin
 about-plugin 'initialize jump (see https://github.com/gsamokovarov/jump)'
 
 __init_jump() {
-  command -v jump &> /dev/null
-  if [ $? -eq 1 ]; then
-    echo -e "You must install jump before you can use this plugin"
-    echo -e "See: https://github.com/gsamokovarov/jump"
-  else
+  command -v jump &> /dev/null || return
   eval "$(jump shell --bind=z)"
-  fi
 }
 
 __init_jump