Ignore JSON.parse expections on PermissionManager constructor
Ignore JSON.parse expections on PermissionManager constructor

https://github.com/mattermost/desktop/pull/633#issuecomment-342508014

mattermost/desktop,mattermost/desktop,mattermost/desktop,mattermost/desktop,yuya-oc/electron-mattermost,yuya-oc/desktop,yuya-oc/desktop,yuya-oc/electron-mattermost,mattermost/desktop,yuya-oc/electron-mattermost,yuya-oc/desktop