Replace the exception case in tizen backend.

Replace the exception case in tizen backend.

Replace the excepption case in tizen backend when display server does not work.
When display server does not work, then ecore_wl2_display_connect() does not work and crash occurs in application size.
To handle the failure case where the display server does not work in the Tizen backend, you can modify the ecore_wl2_display_connect() function to avoid crashing the application.
Specifically, replace the exit() call with a more graceful error handling mechanism.

Change-Id: Ice83d181fe468bc0b9bdcca48f2fcc6496d855f1