Branch tree is NULLified by filedelete command if we are trying
to delete root tree. Add sanity check and use load_tree() in that case.

Signed-off-by: Maxim Bublis <sat...@yandex-team.ru>
---
 fast-import.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fast-import.c b/fast-import.c
index d73f58c..b77f12c 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -1419,7 +1419,7 @@ static void mktree(struct tree_content *t, int v, struct 
strbuf *b)
 
 static void store_tree(struct tree_entry *root)
 {
-       struct tree_content *t = root->tree;
+       struct tree_content *t;
        unsigned int i, j, del;
        struct last_object lo = { STRBUF_INIT, 0, 0, /* no_swap */ 1 };
        struct object_entry *le = NULL;
@@ -1427,6 +1427,10 @@ static void store_tree(struct tree_entry *root)
        if (!is_null_sha1(root->versions[1].sha1))
                return;
 
+       if (!root->tree)
+               load_tree(root)
+       t = root->tree;
+
        for (i = 0; i < t->entry_count; i++) {
                if (t->entries[i]->tree)
                        store_tree(t->entries[i]);
-- 
1.8.5.2 (Apple Git-48)

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