The default settings should not use [].

__tests__/config.test.ts

@@ -14,7 +14,7 @@ test('the default config path handles .yml and .yaml', async () => {
 test('returns a default config when the config file was not found', async () => {
   let options = readConfigFile('fixtures/i-dont-exist')
   expect(options.fail_on_severity).toEqual('low')
-  expect(options.allow_licenses).toEqual([])
+  expect(options.allow_licenses).toEqual(undefined)
 })
 
 test('it reads config files with empty options', async () => {

dist/index.js

@@ -13706,8 +13706,7 @@ exports.CONFIG_FILEPATH = './.github/dependency-review.yml';
 function readConfigFile(filePath = exports.CONFIG_FILEPATH) {
     // By default we want to fail on all severities and allow all licenses.
     const defaultOptions = {
-        fail_on_severity: 'low',
-        allow_licenses: []
+        fail_on_severity: 'low'
     };
     let data;
     try {

src/config.ts

@@ -10,8 +10,7 @@ export function readConfigFile(
 ): ConfigurationOptions {
   // By default we want to fail on all severities and allow all licenses.
   const defaultOptions: ConfigurationOptions = {
-    fail_on_severity: 'low',
-    allow_licenses: []
+    fail_on_severity: 'low'
   }
 
   let data