Fixing PHP warning

main/course_info/infocours.php

@@ -44,7 +44,7 @@ $course_access_settings 	= CourseManager :: get_access_settings($course_code);
 
 //LOGIC FUNCTIONS
 function is_settings_editable() {
-	return $GLOBALS['course_info_is_editable'];
+	return isset($GLOBALS['course_info_is_editable']) && $GLOBALS['course_info_is_editable'];
 }
 
 /* MAIN CODE */
@@ -337,15 +337,15 @@ $form->addElement('style_submit_button', null, get_lang('SaveSettings'), 'class=
 $form->addElement('html', '</div></div>');
 
 
-// Certificate settings 
+// Certificate settings
 
-if (api_get_setting('allow_public_certificates')=='true') {    
+if (api_get_setting('allow_public_certificates')=='true') {
     $form->addElement('html', '<div><h3>'.Display::return_icon('certificate.png', Security::remove_XSS(get_lang('Certificates')),'',ICON_SIZE_SMALL).' '.Security::remove_XSS(get_lang('Certificates')).'</h3><div>');
     $group = array();
     $group[]=$form->createElement('radio', 'allow_public_certificates', get_lang('AllowPublicCertificates'), get_lang('Yes'), 1);
     $group[]=$form->createElement('radio', 'allow_public_certificates', null, get_lang('No'), 0);
     $form->addGroup($group, '', array(get_lang("AllowPublicCertificates")), '');
-    
+
     $form->addElement('style_submit_button', null, get_lang('SaveSettings'), 'class="save"');
     $form->addElement('html', '</div></div>');
 }