Add support export_max_rows for appengine

flask_admin/contrib/appengine/view.py

@@ -58,7 +58,7 @@ class NdbModelView(BaseModelView):
         return result
 
     def get_list(self, page, sort_field, sort_desc, search, filters,
-                 page_size=0):
+                 page_size=None):
         #TODO: implement filters (don't think search can work here)
 
         q = self.model.query()
@@ -72,7 +72,7 @@ class NdbModelView(BaseModelView):
         if not page_size:
             page_size = self.page_size
 
-        results = q.fetch(self.page_size, offset=page*self.page_size)
+        results = q.fetch(page_size, offset=page*page_size)
 
         return q.count(), results