Fix #399 insert records in tables with no SELECT privileges

test/fixtures/privileges.sql

@@ -34,6 +34,8 @@ GRANT ALL ON TABLE
     , users_tasks
 TO postgrest_test_anonymous;
 
+GRANT INSERT ON TABLE insertonly TO postgrest_test_anonymous;
+
 GRANT USAGE ON SEQUENCE
       auto_incrementing_pk_id_seq
     , items_id_seq

test/fixtures/schema.sql

@@ -500,6 +500,15 @@ CREATE TABLE nullable_integer (
 );
 
 
+--
+-- Name: insertonly; Type: TABLE; Schema: test; Owner: -
+--
+
+CREATE TABLE insertonly (
+    v text NOT NULL
+);
+
+
 --
 -- Name: projects; Type: TABLE; Schema: test; Owner: -
 --