Fix crash when reading the empty tree

cvsimport needs to call git-read-tree without arguments to create an empty
tree.

Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/read-tree.c b/read-tree.c
index 067fb95..49436bf 100644 (file)
--- a/read-tree.c
+++ b/read-tree.c
@@ -881,8 +881,8 @@ int main(int argc, char **argv)
         * valid cache-tree because the index must match exactly
         * what came from the tree.
         */
-       if (trees->item && (!merge || (stage == 2))) {
-               cache_tree_free(&active_cache_tree);            
+       if (trees && trees->item && (!merge || (stage == 2))) {
+               cache_tree_free(&active_cache_tree);
                prime_cache_tree();
        }