Index: lucene/core/src/test/org/apache/lucene/index/TestAddIndexes.java
===================================================================
--- lucene/core/src/test/org/apache/lucene/index/TestAddIndexes.java	(revision 1503562)
+++ lucene/core/src/test/org/apache/lucene/index/TestAddIndexes.java	(working copy)
@@ -1205,4 +1205,17 @@
     r3.close();
     d3.close();
   }
+  
+  // nocommit: add one with all deletes too!
+  public void testAddEmpty() throws IOException {
+    Directory d1 = newDirectory();
+    RandomIndexWriter w = new RandomIndexWriter(random(), d1);
+    MultiReader empty = new MultiReader();
+    w.addIndexes(empty);
+    w.close();
+    DirectoryReader dr = DirectoryReader.open(d1);
+    for (AtomicReaderContext ctx : dr.leaves()) {
+      assertTrue(ctx.reader().maxDoc() > 0);
+    }
+  }
 }