Correctly remove apps without any releases

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/private/App/AppStore/Fetcher/AppFetcher.php

@@ -115,6 +115,7 @@ class AppFetcher extends Fetcher {
 
 			if (empty($releases)) {
 				// Remove apps that don't have a matching release
+				$response['data'][$dataKey] = [];
 				continue;
 			}
 
@@ -136,7 +137,7 @@ class AppFetcher extends Fetcher {
 			}
 		}
 
-		$response['data'] = array_values($response['data']);
+		$response['data'] = array_values(array_filter($response['data']));
 		return $response;
 	}