allow exceptions to be a list

sanic/app.py

@@ -227,7 +227,11 @@ class Sanic:
 
         def response(handler):
             for exception in exceptions:
-                self.error_handler.add(exception, handler)
+                if isinstance(exception, (tuple, list)):
+                    for e in exception:
+                        self.error_handler.add(e, handler)
+                else:
+                    self.error_handler.add(exception, handler)
             return handler
 
         return response

tests/test_exceptions.py

@@ -44,6 +44,21 @@ def exception_app():
 
     return app
 
+def test_catch_exception_list():
+    app = Sanic('exception_list')
+    @app.exception([SanicExceptionTestException, NotFound])
+    def exception_list(request, exception):
+        return text("ok")
+
+    @app.route('/')
+    def exception(request):
+        raise SanicExceptionTestException("You won't see me")
+
+    request, response = app.test_client.get('/random')
+    assert response.text == 'ok'
+
+    request, response = app.test_client.get('/')
+    assert response.text == 'ok'
 
 def test_no_exception(exception_app):
     """Test that a route works without an exception"""