fix #759 - check for null uris on bulk read methods

(cherry picked from commit 9376094)

Author: sammefford

src/main/java/com/marklogic/client/impl/OkHttpServices.java

@@ -844,7 +844,9 @@ private OkHttpResultIterator getBulkDocumentsImpl(RequestLogger reqlog,
     addCategoryParams(categories, params, withContent);
     if (format != null)        params.add("format",     format.toString().toLowerCase());
     for (String uri: uris) {
-      params.add("uri", uri);
+      if ( uri != null && uri.length() > 0 ) {
+        params.add("uri", uri);
+      }
     }
     OkHttpResultIterator iterator = getIteratedResourceImpl(DefaultOkHttpResultIterator.class,
       reqlog, path, transaction, params, MIMETYPE_MULTIPART_MIXED);

src/test/java/com/marklogic/client/test/BulkReadWriteTest.java

@@ -682,6 +682,17 @@ public static Country getCountry(String isoCode, Map<String, Country> countries)
         return countries.get(isoCode);
     }
 
+    @Test
+    // https://github.com/marklogic/java-client-api/issues/759
+    public void test_issue_759() throws Exception {
+        String[] uris = new String[150];
+        for ( int i=0; i < 102; i++ ) {
+            String mapDocId = "/" + Integer.toString(i);
+            uris[i] = mapDocId;
+        }
+        Common.client.newDocumentManager().read(uris);
+    }
+
     public static City newCity(String line, Map<String, Country> countries) {
         String[] fields = line.split("	");
         try {