fix torrent poster update on last poster delete #18

src/Service/TorrentService.php

@@ -1209,12 +1209,19 @@ class TorrentService
                 $torrent->setTorrentPosterId(
                     $torrentPoster->getId()
                 );
+            }
+
+            else
+            {
+                $torrent->setTorrentPosterId(
+                    null
+                );
+            }
 
             $this->entityManagerInterface->persist($torrent);
             $this->entityManagerInterface->flush();
         }
     }
-    }