Simplify check for empty variable

Someday this is going to bite me in the ass. Right now though, I can't
come up with a reason not to do this.

Inspiration: test(1)

    -n STRING
           the length of STRING is nonzero

    STRING equivalent to -n STRING

1 files changed, 1 insertions, 1 deletions

diff --git a/.bashprompt b/.bashprompt
index 0ce903f..873746c 100644
--- a/.bashprompt
+++ b/.bashprompt
@@ -3,7 +3,7 @@ __set-title ()
     local title
     local path=$(git root 2> /dev/null)
 
-    if [ -n "${path}" ]
+    if [ ${path} ]
     then
         title=$(basename ${path})
     else