Only init fasd if it is installed.

zsh/fasd.zsh

@@ -1,3 +1,5 @@
+# only init if installed.
+if [[ -d $HOME/.fasd ]]; then
   # Initialize fasd (https://github.com/clvv/fasd)
   eval "$(fasd --init posix-alias zsh-hook)"
 
@@ -10,4 +12,5 @@ alias d='fasd -d' # directory
   alias f='fasd -f' # file
   alias z='fasd_cd -d' # cd, same functionality as j in autojump
   alias v='f -e vim' # quick opening files with vim
+fi