FIxing warnings/notices

main/exercice/question.class.php

@@ -1046,7 +1046,7 @@ abstract class Question
 		$form->addRule('questionName', get_lang('GiveQuestion'), 'required');
 
 		// default content
-		$isContent = intval($_REQUEST['isContent']);
+		$isContent = isset($_REQUEST['isContent']) ? intval($_REQUEST['isContent']) : null;
 
 		// question type
 		$answerType= intval($_REQUEST['answerType']);

main/exercice/unique_answer.class.php

@@ -147,7 +147,7 @@ class UniqueAnswer extends Question {
 
 			for($i = 1 ; $i <= $nb_answers ; ++$i) {
 				$form -> addElement ('html', '<tr>');                
-				if (is_object($answer)) {
+				if (isset($answer) && is_object($answer)) {
 					if ($answer -> correct[$i]) {
 						$correct = $i;
 					}