Bugfix & improved test case.

h2/src/main/org/h2/mvstore/db/TransactionStore.java

@@ -821,7 +821,8 @@ public class TransactionStore {
             while (cursor.hasNext()) {
                 K key = cursor.next();
                 VersionedValue data = cursor.getValue();
-                if (getValue(key, readLogId, data) != null) {
+                data = getValue(key, readLogId, data);
+                if (data != null && data.value != null) {
                     size++;
                 }
             }

h2/src/test/org/h2/test/db/TestTransaction.java

@@ -350,7 +350,9 @@ public class TestTransaction extends TestBase {
                 break;
             case 1:
                 if (count[tableId] > 0) {
-                    stat.execute("DELETE FROM " + table + " WHERE ID=SELECT MIN(ID) FROM " + table);
+                    int updateCount = stat.executeUpdate(
+                            "DELETE FROM " + table + " WHERE ID=SELECT MIN(ID) FROM " + table);
+                    assertEquals(1, updateCount);
                     count[tableId]--;
                 }
                 break;