Backport 5.0 : DND error tone, crash in deviceUtils (java), crash when declining icoming call in call state change listener

Fixed crash when declining icoming call in call state change listener + do not play error tone when declining incoming call with busy or do not disturb reasons

Fixed crash in Android's DeviceUtils if inputStream is null

Backport on 5.0 from:

• liblinphone@a2d99394
• liblinphone@af262d64

liblinphone!1731 (merged)