removed null

Author: dcapwell

src/java/org/apache/cassandra/service/accord/txn/TxnUpdate.java

@@ -530,7 +530,7 @@ else if (cmp < 0)
      * </code>
      * <p>
      * When a non-conditional set of mutations exists with conditional ones, then the non-conditional mutations should
-     * be in their own block with a null/empty condition.
+     * be in their own block with a empty condition.
      */
     final List<Block> blocks;