LUCENE-3253: TestIndexwriterWithThreads#testCloseWithThreads hangs if a thread hit an exception before indexing its first document

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1140574 13f79535-47bb-0310-9956-ffa450edef68

lucene/src/test/org/apache/lucene/index/TestIndexWriterWithThreads.java

@@ -184,6 +184,8 @@ public class TestIndexWriterWithThreads extends LuceneTestCase {
           if (threads[i].addCount > 0) {
             done = true;
             break;
+          } else if (!threads[i].isAlive()) {
+            fail("thread failed before indexing a single document");
           }
       }