Avoid throwing errors

[j4k0xb]

When debugging a web worker script with Pause on caught exceptions enabled it's quite distracting that the debug package throws every time and I have to press continue

I'd appreciate if it instead uses a more defensive approach:

• if (exports.storage):
  

  debug/src/browser.js

  Lines 198 to 200 in f66cb2d

  	try {
  	if (namespaces) {
  	exports.storage.setItem('debug', namespaces);

  
  

  debug/src/browser.js

  Lines 218 to 219 in f66cb2d

  	try {
  	r = exports.storage.getItem('debug');

• if (typeof localStorage !== 'undefined')
  

  debug/src/browser.js

  Lines 245 to 248 in f66cb2d

  	try {
  	// TVMLKit (Apple TV JS Runtime) does not have a window object, just localStorage in the global context
  	// The Browser also has localStorage in the global context.
  	return localStorage;