use different logic to decide whether mission type filter should be shown

src/Bundle/ChillTaskBundle/Repository/SingleTaskAclAwareRepository.php

@@ -82,7 +82,7 @@ final class SingleTaskAclAwareRepository implements SingleTaskAclAwareRepository
             return $qb;
         }
 
-        if (null !== $types   && count($types) > 0) {
+        if (null !== $types && count($types) > 0) {
             $qb->andWhere($qb->expr()->in('t.type', ':types'));
 
             $qb->setParameter('types', $types);

src/Bundle/ChillTaskBundle/Repository/SingleTaskRepository.php

@@ -306,4 +306,28 @@ class SingleTaskRepository extends EntityRepository
             ->add($qb->expr()->isNull('st.endDate'))
             ->add($qb->expr()->isNull('st.warningInterval'));
     }
+
+    public function countByDistinctTypes()
+    {
+        $qb = $this->createQueryBuilder('st')
+            ->select('COUNT(DISTINCT st.type)');
+
+        $this->buildQuery($qb, []);
+
+        return (int) $qb
+            ->getQuery()
+            ->getSingleScalarResult();
+    }
+
+    public function findAllTasktypes()
+    {
+        $qb = $this->createQueryBuilder('st')
+            ->select('DISTINCT st.type');
+
+        $this->buildQuery($qb, []);
+
+        return $qb
+            ->getQuery()
+            ->getResult();
+    }
 }