Minor - fix php notice

main/mySpace/myStudents.php

@@ -1795,6 +1795,7 @@ if (empty($details)) {
     // @when using sessions we do not show the survey list
     if (empty($sessionId)) {
         $survey_list = SurveyManager::get_surveys($course_code, $sessionId);
+        if (!empty($survey_list)) {
             $survey_data = [];
             foreach ($survey_list as $survey) {
                 $user_list = SurveyManager::get_people_who_filled_survey(
@@ -1820,7 +1821,7 @@ if (empty($details)) {
                 $survey_data[] = $data;
             }
 
-        if (!empty($survey_list)) {
+            if (!empty($survey_data)) {
                 $table = new HTML_Table(['class' => 'data_table']);
                 $header_names = [get_lang('Survey'), get_lang('Answered')];
                 $row = 0;
@@ -1830,7 +1831,6 @@ if (empty($details)) {
                     $column++;
                 }
                 $row = 1;
-            if (!empty($survey_data)) {
                 foreach ($survey_data as $data) {
                     $column = 0;
                     $table->setCellContents($row, $column, $data);
@@ -1842,10 +1842,10 @@ if (empty($details)) {
                     $column++;
                     $row++;
                 }
-            }
                 echo $table->toHtml();
             }
         }
+    }
 
     require_once '../work/work.lib.php';
     $userWorks = getWorkPerUser($student_id, $courseInfo['real_id'], $sessionId);