Fix E_NOTICE messages - refs BT#9087

main/admin/teacher_time_report.php

@@ -76,6 +76,7 @@ if (!empty($selectedCourse)) {
     foreach ($sessionsByCourse as $session) {
         $coaches = CourseManager::get_coachs_from_course($session['id'], $selectedCourse);
 
+        if ($coaches) {
             foreach ($coaches as $coach) {
                 $totalTime = SessionManager::getUserTimeInCourse(
                     $coach['user_id'],
@@ -105,6 +106,7 @@ if (!empty($selectedCourse)) {
                 );
             }
         }
+    }
 }
 
 if (!empty($selectedSession)) {
@@ -119,6 +121,7 @@ if (!empty($selectedSession)) {
     foreach ($courses as $course) {
         $coaches = CourseManager::get_coachs_from_course($selectedSession, $course['code']);
 
+        if ($coaches) {
             foreach ($coaches as $coach) {
                 $totalTime = SessionManager::getUserTimeInCourse(
                     $coach['user_id'],
@@ -148,6 +151,7 @@ if (!empty($selectedSession)) {
                 );
             }
         }
+    }
 }
 
 if (!empty($selectedTeacher)) {