Use nullish conversion for packs

Slightly simplifies the `parsePacks` function.

lib/config-utils.js

@@ -441,6 +441,7 @@ exports.getDefaultConfig = getDefaultConfig;
  * Load the config from the given file.
  */
 async function loadConfig(languagesInput, queriesInput, configFile, dbLocation, repository, tempDir, toolCacheDir, codeQL, checkoutPath, gitHubVersion, apiDetails, logger) {
+    var _a;
     let parsedYAML;
     if (isLocal(configFile)) {
         // Treat the config file as relative to the workspace
@@ -522,7 +523,7 @@ async function loadConfig(languagesInput, queriesInput, configFile, dbLocation,
             paths.push(validateAndSanitisePath(includePath, PATHS_PROPERTY, configFile, logger));
         }
     }
-    const packs = parsePacks(parsedYAML[PACKS_PROPERTY], languages, configFile);
+    const packs = parsePacks((_a = parsedYAML[PACKS_PROPERTY], (_a !== null && _a !== void 0 ? _a : {})), languages, configFile);
     return {
         languages,
         queries,
@@ -550,9 +551,6 @@ const PACK_IDENTIFIER_PATTERN = (function () {
 // Exported for testing
 function parsePacks(packsByLanguage, languages, configFile) {
     const packs = {};
-    if (!packsByLanguage) {
-        return packs;
-    }
     if (Array.isArray(packsByLanguage)) {
         if (languages.length === 1) {
             // single language analysis, so language is implicit