Fix NullPointerException when evaluating draft reviews

This change in Gerrit introduced a bug for draft reviews:
https://gerrit-review.googlesource.com/#/c/67762/3/gerrit-server/src/main/java/com/google/gerrit/server/project/SubmitRuleEvaluator.java
An NPE is thrown when the patchSet is not set before calling
SubmitRuleEvaluator#evaluate().  This fix is a workaround until Gerrit
is fixed.

Change-Id: If531822421d501bd7970e03754d5ae5d8f3654ae

src/main/java/com/criteo/gerrit/plugins/automerge/AtomicityHelper.java

diff --git a/src/main/java/com/criteo/gerrit/plugins/automerge/AtomicityHelper.java b/src/main/java/com/criteo/gerrit/plugins/automerge/AtomicityHelper.java
index c7e1cbd..a7db2c0 100644
--- a/src/main/java/com/criteo/gerrit/plugins/automerge/AtomicityHelper.java
+++ b/src/main/java/com/criteo/gerrit/plugins/automerge/AtomicityHelper.java
@@ -111,7 +111,7 @@
    */
   public boolean isSubmittable(String project, int change) throws OrmException {
     ChangeData changeData = changeDataFactory.create(db.get(), new Project.NameKey(project), new Change.Id(change));
-    List<SubmitRecord> cansubmit = new SubmitRuleEvaluator(changeData).evaluate();
+    List<SubmitRecord> cansubmit = new SubmitRuleEvaluator(changeData).setPatchSet(changeData.currentPatchSet()).evaluate();
     log.debug(String.format("Checking if change %d is submitable.", change));
     for (SubmitRecord submit : cansubmit) {
       if (submit.status != SubmitRecord.Status.OK) {