am d6570b0b: Fix docs for classes that implement or extend generics with type parameters

* commit 'd6570b0b7f66519ba50c18d9e08db423bdf1341e':
  Fix docs for classes that implement or extend generics with type parameters
diff --git a/src/com/google/doclava/ClassInfo.java b/src/com/google/doclava/ClassInfo.java
index f5309bb..14cd99c 100644
--- a/src/com/google/doclava/ClassInfo.java
+++ b/src/com/google/doclava/ClassInfo.java
@@ -1586,7 +1586,7 @@
   }
 
   public boolean hasShowAnnotation() {
-    return mShowAnnotations.size() > 0;
+    return mShowAnnotations != null && mShowAnnotations.size() > 0;
   }
 
   public ArrayList<AnnotationInstanceInfo> showAnnotations() {