Fix entities, check if entity exists

src/CoreBundle/Entity/AbstractResource.php

@@ -425,12 +425,12 @@ abstract class AbstractResource
         $everyone = false;
         $links = $this->getResourceNode()->getResourceLinks();
         foreach ($links as $link) {
-            if ($link->getUser()) {
+            if ($link->hasUser()) {
                 $users[] = $link->getUser()->getId();
 
                 continue;
             }
-            if ($link->getGroup()) {
+            if ($link->hasGroup()) {
                 $groups[] = $link->getGroup()->getIid();
             }
         }

src/CourseBundle/Entity/CAttendance.php

@@ -9,6 +9,7 @@ namespace Chamilo\CourseBundle\Entity;
 use Chamilo\CoreBundle\Entity\AbstractResource;
 use Chamilo\CoreBundle\Entity\ResourceInterface;
 use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
 use Doctrine\ORM\Mapping as ORM;
 use Symfony\Component\Validator\Constraints as Assert;
 
@@ -222,12 +223,12 @@ class CAttendance extends AbstractResource implements ResourceInterface
         return $this->iid;
     }
 
-    public function getCalendars(): ArrayCollection
+    public function getCalendars(): Collection
     {
         return $this->calendars;
     }
 
-    public function setCalendars(ArrayCollection $calendars): self
+    public function setCalendars(Collection $calendars): self
     {
         $this->calendars = $calendars;
 

src/CourseBundle/Entity/CForumPost.php

@@ -11,6 +11,7 @@ use Chamilo\CoreBundle\Entity\ResourceInterface;
 use Chamilo\CoreBundle\Entity\User;
 use DateTime;
 use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
 use Doctrine\ORM\Mapping as ORM;
 use Symfony\Component\Validator\Constraints as Assert;
 
@@ -323,7 +324,7 @@ class CForumPost extends AbstractResource implements ResourceInterface
         return $this->iid;
     }
 
-    public function getAttachments(): ArrayCollection
+    public function getAttachments(): Collection
     {
         return $this->attachments;
     }

src/CourseBundle/Entity/CSurvey.php

@@ -191,7 +191,9 @@ class CSurvey extends AbstractResource implements ResourceInterface
         $this->invited = 0;
         $this->answered = 0;
         $this->subtitle = '';
+        $this->author = '';
         $this->inviteMail = '';
+        $this->lang = '';
         $this->reminderMail = '';
         $this->mailSubject = '';
         $this->shuffle = false;

src/CourseBundle/Entity/CThematic.php

@@ -78,6 +78,7 @@ class CThematic extends AbstractResource implements ResourceInterface
     {
         $this->plans = new ArrayCollection();
         $this->advances = new ArrayCollection();
+        $this->active = true;
     }
 
     public function __toString(): string