Merge branch 'nd/edit-branch-desc-while-detached'

Attempt to "branch --edit-description" an existing branch, while
being on a detached HEAD, errored out.

* nd/edit-branch-desc-while-detached:
  branch: no detached HEAD check when editing another branch's description

Author: gitster

builtin/branch.c

@@ -850,11 +850,11 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 		const char *branch_name;
 		struct strbuf branch_ref = STRBUF_INIT;
 
-		if (detached)
-			die("Cannot give description to detached HEAD");
-		if (!argc)
+		if (!argc) {
+			if (detached)
+				die("Cannot give description to detached HEAD");
 			branch_name = head;
-		else if (argc == 1)
+		} else if (argc == 1)
 			branch_name = argv[0];
 		else
 			usage_with_options(builtin_branch_usage, options);