refs #5654, fix invariants to run only if a txn exists, in some unit tests, a txn does not exist

git-svn-id: file:///svn/toku/tokudb@50453 c7de825b-a66e-492c-adef-691d508d4ae1

src/indexer-undo-do.cc

@@ -294,7 +294,7 @@ indexer_undo_do_provisional(DB_INDEXER *indexer, DB *hotdb, ULEHANDLE ule, struc
                     case TOKUTXN_LIVE:
                     case TOKUTXN_PREPARING:
                         invariant(this_xid_state != TOKUTXN_ABORTING);
-                        invariant(toku_txn_get_state(curr_txn) == TOKUTXN_LIVE || toku_txn_get_state(curr_txn) == TOKUTXN_PREPARING);
+                        invariant(!curr_txn || toku_txn_get_state(curr_txn) == TOKUTXN_LIVE || toku_txn_get_state(curr_txn) == TOKUTXN_PREPARING);
                         result = indexer_ft_delete_provisional(indexer, hotdb, &indexer->i->hotkey, xids, curr_txn);
                         if (result == 0) {
                             indexer_lock_key(indexer, hotdb, &indexer->i->hotkey, prov_ids[0], curr_txn);
@@ -328,7 +328,7 @@ indexer_undo_do_provisional(DB_INDEXER *indexer, DB *hotdb, ULEHANDLE ule, struc
                 case TOKUTXN_LIVE:
                 case TOKUTXN_PREPARING:
                     assert(this_xid_state != TOKUTXN_ABORTING);
-                        invariant(toku_txn_get_state(curr_txn) == TOKUTXN_LIVE || toku_txn_get_state(curr_txn) == TOKUTXN_PREPARING);
+                    invariant(!curr_txn || toku_txn_get_state(curr_txn) == TOKUTXN_LIVE || toku_txn_get_state(curr_txn) == TOKUTXN_PREPARING);
                     result = indexer_ft_insert_provisional(indexer, hotdb, &indexer->i->hotkey, &indexer->i->hotval, xids, curr_txn);
                     if (result == 0) {
                         indexer_lock_key(indexer, hotdb, &indexer->i->hotkey, prov_ids[0], prov_txns[0]);