Documentation/config.txt: make truth value of numbers more explicit

diff --git a/git-bisect.sh b/git-bisect.sh
index c21e33c8d133af0e9e0ae3edaffd0a5593ff4ac3..415a8d04ccc4f313eb111a3bbfbf2af2382beebd 100755 (executable)
--- a/git-bisect.sh
+++ b/git-bisect.sh
@@ -288,10 +288,12 @@ bisect_visualize() {
 
        if test $# = 0
        then
-               case "${DISPLAY+set}${SESSIONNAME+set}${MSYSTEM+set}${SECURITYSESSIONID+set}" in
-               '')     set git log ;;
-               set*)   set gitk ;;
-               esac
+               if test -n "${DISPLAY+set}${SESSIONNAME+set}${MSYSTEM+set}${SECURITYSESSIONID+set}" &&
+                  type gitk >/dev/null 2>&1; then
+                       set gitk
+               else
+                       set git log
+               fi
        else
                case "$1" in
                git*|tig) ;;