From e2a5e5241eb7e838c6d483800bde4bdb67af3949 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sun, 19 Aug 2018 17:47:39 +0100
Subject: [PATCH] git-debrebase: get_tree: Support '' for nonexistent objects

This is going to be convenient in a moment.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 git-debrebase | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/git-debrebase b/git-debrebase
index 8fa5adb7..57bfa982 100755
--- a/git-debrebase
+++ b/git-debrebase
@@ -187,8 +187,12 @@ sub get_tree ($) {
     # tree object name => ([ $name, $info ], ...)
     # where $name is the sort key, ie has / at end for subtrees
     # $info is the LHS from git-ls-tree (<mode> <type> <hash>)
-    # will crash if $x does not exist, so don't do that
+    # will crash if $x does not exist, so don't do that;
+    # instead pass '' to get ().
     my ($x) = @_;
+
+    return () if !length $x;
+
     our (@get_tree_memo, %get_tree_memo);
     my $memo = $get_tree_memo{$x};
     return @$memo if $memo;
-- 
2.30.2