Check if notification is valid before it finally vibrates because it can be...

Check if notification is valid before it finally vibrates because it can be canceled as soon as enqeued

Test: Build and run StatusBarTest/_NotifyBuilder
Test: Set notification sound and vibration
Test: Make notification with + button, and cancel it with - button quickly
TEst: Check notification not vibrating

Change-Id: Ia21f45c165f863ed4143da3707b492c89e58387c
Signed-off-by: Seungho Lee <shiny.lee@samsung.com>