LUCENE-1058: override the close method so it doesn't try to close the null Reader input

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@601748 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/lucene/analysis/SinkTokenizer.java

@@ -64,6 +64,12 @@ public class SinkTokenizer extends Tokenizer {
     lst.add((Token) t.clone());
   }
 
+  public void close() throws IOException {
+    //nothing to close
+    input = null;
+    lst = null;
+  }
+
   /**
    * Reset the internal data structures to the start at the front of the list of tokens.  Should be called
    * if tokens were added to the list after an invocation of {@link #next(Token)}