Fixed exception when trying to export an empty entity list

Fixes issue #836

Author: jbtronics

src/Controller/AdminPages/BaseAdminController.php

@@ -467,6 +467,11 @@ protected function _exportAll(EntityManagerInterface $em, EntityExporter $export
         $this->denyAccessUnlessGranted('read', $entity);
         $entities = $em->getRepository($this->entity_class)->findAll();
 
+        if (count($entities) === 0) {
+            $this->addFlash('error', 'entity.export.flash.error.no_entities');
+            return $this->redirectToRoute($this->route_base.'_new');
+        }
+
         return $exporter->exportEntityFromRequest($entities, $request);
     }
 

src/Controller/PartImportExportController.php

@@ -112,8 +112,9 @@ public function exportParts(Request $request, EntityExporter $entityExporter): R
         $ids = $request->query->get('ids', '');
         $parts = $this->partsTableActionHandler->idStringToArray($ids);
 
-        if ($parts === []) {
-            throw new \RuntimeException('No parts found!');
+        if (count($parts) === 0) {
+            $this->addFlash('error', 'entity.export.flash.error.no_entities');
+            return $this->redirectToRoute('homepage');
         }
 
         //Ensure that we have access to the parts

translations/messages.en.xlf

@@ -12323,5 +12323,11 @@ Please note, that you can not impersonate a disabled user. If you try you will g
         <target>Profile saved!</target>
       </segment>
     </unit>
+    <unit id="8C9ijHM" name="entity.export.flash.error.no_entities">
+      <segment>
+        <source>entity.export.flash.error.no_entities</source>
+        <target>There are no entities to export!</target>
+      </segment>
+    </unit>
   </file>
 </xliff>