SLING-6869 fsresource: Avoid NPE when content fragment file contains invalid JSON

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1795847 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/sling/fsprovider/internal/mapper/ContentFile.java b/src/main/java/org/apache/sling/fsprovider/internal/mapper/ContentFile.java
index dd31346..184d184 100644
--- a/src/main/java/org/apache/sling/fsprovider/internal/mapper/ContentFile.java
+++ b/src/main/java/org/apache/sling/fsprovider/internal/mapper/ContentFile.java
@@ -84,7 +84,7 @@
             if (subPath == null) {
                 content = rootContent;
             }
-            else {
+            else if (rootContent != null) {
                 content = rootContent.getChild(subPath);
             }
             contentInitialized = true;