git-gui: Give a better error message on an empty branch name.
tree4ab5ce5a55e2c4cdb207d7a6532885c5eb80bff4
-rw-r--r-- 36 .gitignore
-rwxr-xr-x 745 GIT-VERSION-GEN
-rw-r--r-- 1200 Makefile
-rw-r--r-- 1948 TODO
-rwxr-xr-x 102447 git-gui.sh