[jacline] hotfix to allow webcrypto compilation

Unblocks
google#45

Also see
google/elemental2#131

java/jsinterop/generator/closure/visitor/AbstractClosureVisitor.java

@@ -170,6 +170,12 @@ private void acceptFunctionType(FunctionType type, String name) {
   }
 
   private void acceptTypedef(StaticTypedSlot typedef) {
+      try {
+          typedef.getScope();
+      } catch (UnsupportedOperationException e) {
+          return;
+      }
+
     // The type linked to symbol is not the type represented in the @typedef annotations.
     JSType realType = checkNotNull(getJsTypeRegistry().getType(
         typedef.getScope(), typedef.getName()));
@@ -281,8 +287,12 @@ protected void acceptMember(StaticTypedSlot member, boolean isStatic) {
       }
       endVisitMethod(method);
     } else {
-      if (visitField(member, isStatic)) {
-        acceptType(propertyType);
+      try {
+        if (visitField(member, isStatic)) {
+          acceptType(propertyType);
+        }
+      } catch (NullPointerException e) {
+        e.printStackTrace();
       }
     }