Some properties are not updated in Add new Subscriber action

[stas-fomenko]

STR:

1. Create new subscription.

2. Try to update created subscription:
   

3. See that some properties are not updated
   

AR: Some properties are not updated in Add new Subscriber action and no error message shown

ER:
depends on API:

• if possible - throw an error message when a property is not updated
• if API does not provide with this option - specify this behavior in README, because as a user I expect a property to be updated according to specified value if no error thrown