Fix UnboundLocalError in test_numpy_results_paged

Initialize `count` variable before the for loop to prevent
UnboundLocalError when the loop doesn't execute. This follows
the same pattern already used in verify_iterator_data().

Author: dkropachev

tests/integration/standard/test_cython_protocol_handlers.py

@@ -110,6 +110,7 @@ def test_numpy_results_paged(self):
         results = session.execute("SELECT * FROM test_table")
 
         assert results.has_more_pages
+        count = 0
         for count, page in enumerate(results, 1):
             assert isinstance(page, dict)
             for colname, arr in page.items():