fix: add default value form params in pyramid webtest

fix #350

--HG--
branch : 3.32

cubicweb/pyramid/test/__init__.py

@@ -17,14 +17,15 @@ class TestApp(webtest.TestApp):
     def post(
         self,
         route,
-        params,
+        params=None,
         do_not_grab_the_crsf_token=False,
         do_not_inject_origin=False,
         form_with_csrf_token_url="/login",
         form_number=0,
         **kwargs,
     ):
-
+        if params is None:
+            params = {}
         if self._ident_cookie:
             if "headers" in kwargs and "Cookie" not in kwargs["headers"]:
                 kwargs["headers"]["Cookie"] = self._ident_cookie