FIX: sync create subject for discipline without teachers [2]

~dev_rating/application/classes/Controller/Api/V0/StudyPlan.php

@@ -18,9 +18,7 @@ class Controller_Api_V0_StudyPlan extends Controller_Handler_Api {
         }
 
         if (empty($disciplineData->teacherIDs)) {
-            if (!empty($disciplineData->teachers)) {
-                throw new InvalidArgumentException('Discipline without teachers');
-            }
+            throw new InvalidArgumentException('Discipline without teachers');
         }
 
         switch ($disciplineData->type) {