Fix for no error dialog for the first time error

The default value of CF Preference is disable.
So, error dialog is not displayed for the first
time error for query call forwarding.

Prevent duplicated call of onError method.

Test: manual

Signed-off-by: Sungjae <sung_jae.kim@samsung.com>
Change-Id: I0ac9da5cb588e94b202d86f9629d12f90e603d8e
2 files changed