Minor - fix php warnings

main/inc/lib/certificate.lib.php

@@ -624,7 +624,11 @@ class Certificate extends Model
 
         $extraFieldValue = new ExtraFieldValue('user');
         $value = $extraFieldValue->get_values_by_handler_and_field_variable($this->user_id, 'legal_accept');
-        list($id, $id2, $termsValidationDate) = explode(':', $value['value']);
+
+        $termsValidationDate = '';
+        if (isset($value) && !empty($value['value'])) {
+            list($id, $id2, $termsValidationDate) = explode(':', $value['value']);
+        }
 
         $sessions = SessionManager::get_sessions_by_user($this->user_id);
         $sessionsApproved = [];
@@ -672,7 +676,8 @@ class Certificate extends Model
 
         $skill = new Skill();
         $skills = $skill->getStudentSkills($this->user_id);
-        $time = api_time_to_hms(Tracking::get_time_spent_on_the_platform($this->user_id));
+        $timeInSeconds = Tracking::get_time_spent_on_the_platform($this->user_id);
+        $time = api_time_to_hms($timeInSeconds);
 
         $tplContent = new Template(null, false, false, false, false, false);
 
@@ -680,10 +685,13 @@ class Certificate extends Model
         $tplContent->assign('complete_name', $userInfo['complete_name']);
         $tplContent->assign('time_in_platform', $time);
         $tplContent->assign('certificate_generated_date', api_get_local_time($myCertificate['created_at']));
-        $tplContent->assign('terms_validation_date', api_get_local_time($termsValidationDate));
+        if (!empty($termsValidationDate)) {
+            $termsValidationDate = api_get_local_time($termsValidationDate);
+        }
+        $tplContent->assign('terms_validation_date', $termsValidationDate);
 
         // Ofaj
-        $tplContent->assign('time_in_platform_in_hours', round($time/3600, 1));
+        $tplContent->assign('time_in_platform_in_hours', round($timeInSeconds/3600, 1));
         $tplContent->assign(
             'certificate_generated_date_no_time',
             api_get_local_time(

main/mySpace/myStudents.php

@@ -698,7 +698,7 @@ $userGroups = $userGroupManager->getNameListByUser(
                     'legal_accept'
                 );
                 $icon = Display::return_icon('accept_na.png');
-                if (isset($value['value'])) {
+                if (isset($value['value']) && !empty($value['value'])) {
                     list($legalId, $legalLanguageId, $legalTime) = explode(':', $value['value']);
                     $icon = Display::return_icon('accept.png').' '.api_get_local_time($legalTime);
                     $icon .= ' '.Display::url(