SLING-5456 - avoid NPE

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1727948 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/sling/jcr/base/AbstractSlingRepositoryManager.java b/src/main/java/org/apache/sling/jcr/base/AbstractSlingRepositoryManager.java
index db2a5cc..8a8b18f 100644
--- a/src/main/java/org/apache/sling/jcr/base/AbstractSlingRepositoryManager.java
+++ b/src/main/java/org/apache/sling/jcr/base/AbstractSlingRepositoryManager.java
@@ -359,6 +359,7 @@
         final ServiceReference [] refs = repoInitializerTracker.getServiceReferences();
         if(refs == null || refs.length == 0) {
             log.debug("No SlingRepositoryInitializer services found");
+            return;
         }
         Arrays.sort(refs);
         for(ServiceReference ref : refs) {