Merge pull request #49 from fotonauts/mongoc_bulk_operation_execute_without_reply

reply doesn't seem to be required so let's not call bson_init() if it is not set

Author: chergert

src/mongoc/mongoc-bulk-operation.c

@@ -287,7 +287,9 @@ mongoc_bulk_operation_execute (mongoc_bulk_operation_t *bulk,  /* IN */
 
    bulk->executed = true;
 
-   bson_init (reply);
+   if (reply) {
+      bson_init (reply);
+   }
 
    if (!bulk->commands.len) {
       bson_set_error (error,