Undefined properties and nested folders handling
Undefined properties and nested folders handling

fix #5291
fix #5293

requires https://github.com/brave/electron/pull/85

Auditors: @bridiver, @bbondy

Test Plan:
1. Go to about:preferences#security
2. Select Lastpass as password manager
3. Login to Lastpass
4. Right click to show context menu
5. Nested menu of Lastpass should show

jonathansampson/browser-laptop,Sh1d0w/browser-laptop,timborden/browser-laptop,darkdh/browser-laptop,pmkary/braver,dcposch/browser-laptop,dcposch/browser-laptop,timborden/browser-laptop,luixxiul/browser-laptop,timborden/browser-laptop,pmkary/braver,pmkary/braver,luixxiul/browser-laptop,dcposch/browser-laptop,diasdavid/browser-laptop,luixxiul/browser-laptop,jonathansampson/browser-laptop,diasdavid/browser-laptop,luixxiul/browser-laptop,jonathansampson/browser-laptop,darkdh/browser-laptop,jonathansampson/browser-laptop,diasdavid/browser-laptop,darkdh/browser-laptop,dcposch/browser-laptop,Sh1d0w/browser-laptop,willy-b/browser-laptop,willy-b/browser-laptop,darkdh/browser-laptop,Sh1d0w/browser-laptop,willy-b/browser-laptop,timborden/browser-laptop,pmkary/braver,Sh1d0w/browser-laptop,diasdavid/browser-laptop,willy-b/browser-laptop