branch_get sometimes returns current_branch, which can be NULL (e.g., if
you're on a detached HEAD). Try:

  $ git branch HEAD
  fatal: no such branch 'HEAD'

  $ git branch ''
  fatal: no such branch ''

However, it seems weird that we'd check those cases here (and provide
such lousy messages). And indeed, dropping that and letting us
eventually hit create_branch() gives a much better message:

  $ git branch HEAD
  fatal: 'HEAD' is not a valid branch name.

  $ git branch ''
  fatal: '' is not a valid branch name.

Signed-off-by: Tao Qingyun <ta...@ls-a.me>
---
 builtin/branch.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/builtin/branch.c b/builtin/branch.c
index c396c41533..2367703034 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -809,11 +809,6 @@ int cmd_branch(int argc, const char **argv, const char 
*prefix)
                git_config_set_multivar(buf.buf, NULL, NULL, 1);
                strbuf_release(&buf);
        } else if (argc > 0 && argc <= 2) {
-               struct branch *branch = branch_get(argv[0]);
-
-               if (!branch)
-                       die(_("no such branch '%s'"), argv[0]);
-
                if (filter.kind != FILTER_REFS_BRANCHES)
                        die(_("-a and -r options to 'git branch' do not make 
sense with a branch name"));
 
-- 
2.19.0

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