Added a check if homebrew is installed, fixed #1050 #1308

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@@ -3,7 +3,7 @@ if [ $commands[autojump] ]; then # check if autojump is installed
. /usr/share/autojump/autojump.zsh
elif [ -f /etc/profile.d/autojump.zsh ]; then # manual installation
. /etc/profile.d/autojump.zsh
- elif [ $commands[brew] -a -f `brew --prefix`/etc/autojump ]; then # mac os x with brew
+ elif [[ -n $commands[brew] ]] && [ $commands[brew] -a -f `brew --prefix`/etc/autojump ]; then # mac os x with brew
. `brew --prefix`/etc/autojump
fi
fi