From 8b972966f8ad38912b95d8ed61f24bfb22a7a838 Mon Sep 17 00:00:00 2001
From: Luke Murphy <lukewm@riseup.net>
Date: Tue, 12 Jun 2018 14:37:55 +0200
Subject: [PATCH] Don't ask for description if no schema exists.

Related to https://github.com/axnsan12/drf-yasg/issues/143.
---
 src/drf_yasg/inspectors/query.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/drf_yasg/inspectors/query.py b/src/drf_yasg/inspectors/query.py
index 1cd8d696..b93be7ac 100644
--- a/src/drf_yasg/inspectors/query.py
+++ b/src/drf_yasg/inspectors/query.py
@@ -43,12 +43,17 @@ def coreapi_field_to_parameter(self, field):
             coreschema.String: openapi.TYPE_STRING,
             coreschema.Boolean: openapi.TYPE_BOOLEAN,
         }
+
+        parameter_kwargs = {}
+        if field.schema is not None:
+            parameter_kwargs = {'description': field.schema.description}
+
         return openapi.Parameter(
             name=field.name,
             in_=location_to_in[field.location],
             type=coreapi_types.get(type(field.schema), openapi.TYPE_STRING),
             required=field.required,
-            description=field.schema.description,
+            **parameter_kwargs
         )