Remove warning in cosmogramme patch loop

cosmogramme/php/util_patch_sgbd.php

@@ -144,7 +144,7 @@ function runSqlUpgrade($script, $sql) {
 		flush();
 		// Executer
 		$num_instruction++;
-		if($_REQUEST['reprise'] > 0 and $_REQUEST["reprise"] >= $num_instruction)
+		if (isset($_REQUEST['reprise']) and ($_REQUEST['reprise'] > 0) and ($_REQUEST["reprise"] >= $num_instruction))
 			continue;
 		try {
 			$sql->execute($instruction);