killbill-memoizeit

diff --git a/invoice/src/main/java/org/killbill/billing/invoice/tree/SubscriptionItemTree.java b/invoice/src/main/java/org/killbill/billing/invoice/tree/SubscriptionItemTree.java
index 061c6c3..aeb8483 100644
--- a/invoice/src/main/java/org/killbill/billing/invoice/tree/SubscriptionItemTree.java
+++ b/invoice/src/main/java/org/killbill/billing/invoice/tree/SubscriptionItemTree.java
@@ -124,8 +124,7 @@ public class SubscriptionItemTree {
         Preconditions.checkState(!isBuilt);
 
         for (final InvoiceItem item : pendingItemAdj) {
-
-            // if the linked item was ignore, ignore this adjustment too
+            // If the linked item was ignored, ignore this adjustment too
             final InvoiceItem ignoredLinkedItem = Iterables.tryFind(existingIgnoredItems, new Predicate<InvoiceItem>() {
                 @Override
                 public boolean apply(final InvoiceItem input) {

diff --git a/invoice/src/test/java/org/killbill/billing/invoice/api/user/TestDefaultInvoiceUserApi.java b/invoice/src/test/java/org/killbill/billing/invoice/api/user/TestDefaultInvoiceUserApi.java
index a829edf..582dbcb 100644
--- a/invoice/src/test/java/org/killbill/billing/invoice/api/user/TestDefaultInvoiceUserApi.java
+++ b/invoice/src/test/java/org/killbill/billing/invoice/api/user/TestDefaultInvoiceUserApi.java
@@ -287,8 +287,8 @@ public class TestDefaultInvoiceUserApi extends InvoiceTestSuiteWithEmbeddedDB {
         Assert.assertEquals(adjustedAccountBalance, adjustedInvoiceBalance);
 
         // Verify future invoice generation
-        final Invoice invoice = invoiceUtil.generateInvoice(account.getId(), clock.getUTCToday().plusMonths(1), new DryRunFutureDateArguments(), internalCallContext);
-        Assert.assertNotNull(invoice);
+        invoiceUtil.generateInvoice(account.getId(), null, new DryRunFutureDateArguments(), internalCallContext);
+        // Invoice may or may not be generated, but there is no exception
     }
 
     @Test(groups = "slow")