Support for new Flask errorhandling

puppetboard/app.py

@@ -17,6 +17,7 @@ from flask import (
 )
 
 from pypuppetdb import connect
+from pypuppetdb.errors import EmptyResponseError
 from pypuppetdb.QueryBuilder import *
 
 from puppetboard.forms import (CatalogForm, QueryForm)
@@ -115,9 +116,13 @@ class NoContent(ex.HTTPException):
 
 abort.mapping[204] = NoContent
 
-
-@app.errorhandler(204)
-def no_content(e):
+try:
+    @app.errorhandler(204)
+    def no_content(e):
+        return '', 204
+except KeyError:
+    @app.errorhandler(EmptyResponseError)
+    def no_content(e):
         return '', 204