allow empty date in export (#1338)

src/Controller/ExportController.php

@@ -143,8 +143,12 @@ class ExportController extends AbstractController
      */
     protected function getEntries(ExportQuery $query): array
     {
-        $query->getBegin()->setTime(0, 0, 0);
-        $query->getEnd()->setTime(23, 59, 59);
+        if (null !== $query->getBegin()) {
+            $query->getBegin()->setTime(0, 0, 0);
+        }
+        if (null !== $query->getEnd()) {
+            $query->getEnd()->setTime(23, 59, 59);
+        }
 
         return $this->timesheetRepository->getTimesheetsForQuery($query, true);
     }

src/Form/Toolbar/AbstractToolbarForm.php

@@ -122,10 +122,10 @@ abstract class AbstractToolbarForm extends AbstractType
         ]);
     }
 
-    protected function addDateRangeChoice(FormBuilderInterface $builder, $allowEmpty = true)
+    protected function addDateRangeChoice(FormBuilderInterface $builder, $allowEmpty = true, $required = false)
     {
         $builder->add('daterange', DateRangeType::class, [
-            'required' => false,
+            'required' => $required,
             'allow_empty' => $allowEmpty,
         ]);
     }