Error in signature of callproc() and execute() (#966)

Author: pauricthelodger

graphene_django/debug/sql/tracking.py

@@ -148,10 +148,10 @@ def _record(self, method, sql, params):
             # We keep `sql` to maintain backwards compatibility
             self.logger.object.sql.append(_sql)
 
-    def callproc(self, procname, params=()):
+    def callproc(self, procname, params=None):
         return self._record(self.cursor.callproc, procname, params)
 
-    def execute(self, sql, params=()):
+    def execute(self, sql, params=None):
         return self._record(self.cursor.execute, sql, params)
 
     def executemany(self, sql, param_list):