Fix inconsistent validation bug

controller/documentcontroller.php

@@ -110,13 +110,13 @@ class DocumentController extends Controller{
 			try {
 				$wopiClient = \OC::$server->getHTTPClientService()->newClient();
 				$xmlBody = $wopiClient->get($wopiDiscovery)->getBody();
-				if (!$xmlBody) {
-					return $this->responseError('failure body content', $wopiRemote);
-				}
 			}
 			catch (\Exception $e) {
 				return $this->responseError($e->getMessage(), $wopiRemote);
 			}
+
+			if (!$xmlBody) {
+				return $this->responseError('failure body content', $wopiRemote);
 			}
 
 			$loadEntities = libxml_disable_entity_loader(true);
@@ -128,6 +128,7 @@ class DocumentController extends Controller{
 			else {
 				return $this->responseError('failure discovery.xml not well-formed XML string', $wopiRemote);
 			}
+		}
 
 		\OC::$server->getNavigationManager()->setActiveEntry( 'richdocuments_index' );
 		$maxUploadFilesize = \OCP\Util::maxUploadFilesize("/");