lib: return undefined for localStorage when location is invalid

Author: danielmbrasil

lib/internal/webstorage.js

@@ -4,13 +4,11 @@ const {
 } = primordials;
 const { ERR_INVALID_ARG_VALUE } = require('internal/errors').codes;
 const { getOptionValue } = require('internal/options');
-const { emitExperimentalWarning } = require('internal/util');
 const { kConstructorKey, Storage } = internalBinding('webstorage');
 const { getValidatedPath } = require('internal/fs/utils');
+const { emitWarning } = require('process');
 const kInMemoryPath = ':memory:';
 
-emitExperimentalWarning('Web Storage');
-
 module.exports = { Storage };
 
 let lazyLocalStorage;
@@ -27,9 +25,9 @@ ObjectDefineProperties(module.exports, {
         const location = getOptionValue('--localstorage-file');
 
         if (location === '') {
-          throw new ERR_INVALID_ARG_VALUE('--localstorage-file',
-                                          location,
-                                          'is an invalid localStorage location');
+          emitWarning(`${location} is an invalid localStorage location`);
+
+          return undefined;
         }
 
         lazyLocalStorage = new Storage(kConstructorKey, getValidatedPath(location));