[XBEAN-326] Avoid NPE when superclass is null


git-svn-id: https://svn.apache.org/repos/asf/geronimo/xbean/trunk@1888128 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/xbean-finder/src/main/java/org/apache/xbean/finder/BundleAssignableClassFinder.java b/xbean-finder/src/main/java/org/apache/xbean/finder/BundleAssignableClassFinder.java
index aadcd19..0255167 100644
--- a/xbean-finder/src/main/java/org/apache/xbean/finder/BundleAssignableClassFinder.java
+++ b/xbean-finder/src/main/java/org/apache/xbean/finder/BundleAssignableClassFinder.java
@@ -108,6 +108,9 @@
                 }
             }
             String superClassName = classReader.getSuperName();
+            if (superClassName == null) {
+                return false;
+            }
             if (wiredImportedPackageNames.contains(toASMStylePackageName(superClassName))) {
                 return isClassAssignable(bundle.loadClass(toJavaStyleClassName(superClassName)));
             }