rel #13414 : ignore php error on deserialization

cosmogramme/sql/patch/patch_203.php

@@ -20,8 +20,12 @@ for ($i = 1; $i <= $page_count; ++$i) {
 		}
 
 		// already serialized array, do nothing
-		if (is_array(unserialize($zone_995)))
+		set_error_handler(function() {});
+		if (is_array(unserialize($zone_995))) {
+			restore_error_handler();
 			continue;
+		}
+		restore_error_handler();
 
 		$values = explode(' ', $zone_995);
 		$new_zone_995 = [];