Merge pull request #22761 from backstage/rugvip/allow-empty

cli: stop requiring configuration for the frontend build

packages/config-loader/src/schema/compile.ts

@@ -190,7 +190,7 @@ export function compileConfigSchemas(
   });
 
   return configs => {
-    const config = ConfigReader.fromConfigs(configs).get();
+    const config = ConfigReader.fromConfigs(configs).getOptional();
 
     visibilityByDataPath.clear();
     deepVisibilityByDataPath.clear();