Fix cding home when no matching directory in fish (#64)

Fix `cd`ing into `$HOME` when no match is found in `fish` shell

CHANGELOG.md

@@ -18,6 +18,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Interactive mode in `zoxide` no longer throws an error if `fzf` exits gracefully.
 - Canonicalize to regular paths instead of UNC paths on Windows.
 
+### Fixed
+
+- `fish` no longer `cd`s to the user's home when no match is found.
+
 ## [0.3.1] - 2020-04-03
 
 ### Added

src/subcommand/init.rs

@@ -164,7 +164,7 @@ function {}
         set -l IFS ''
         set -l result (zoxide query $argv)
 
-        if test -d $result
+        if test -d $result; and string length -q -- $result
             _z_cd $result
             or return $status
         else if test -n "$result"