small fix

lib/uninstall.bash

@@ -3,7 +3,7 @@
 # MAIN
 [[ "$UID" -ne 0 ]] && echo 'root privilege required' && exit 1
 
-cd 
+cd || exit
 
 if [[ -f /etc/bash.bashrc.ORIGINAL ]]; then
   rm /etc/bash.bashrc
@@ -18,4 +18,5 @@ fi
 rm -f /etc/vimrc/vimrc.{azerty,core,local,miaou,rookie}
 rm -rf /opt/miaou-bash
 
+unset MIAOU_BASH_DIR
 echo 'MIAOU-BASH fully uninstalled, restored from original'