Fix potential Telecom crash if TelephonyManager throws exception.

    private boolean isPotentialEmergencyNumber(String number) {

        Log.v(this, "Checking restrictions for number : %s", Log.pii(number));

        if (number == null) return false;

        return mContext.getSystemService(TelephonyManager.class).isPotentialEmergencyNumber(number);

        try {

            return mContext.getSystemService(TelephonyManager.class).isPotentialEmergencyNumber(

                    number);

        } catch (Exception e) {

            Log.e(this, e, "isPotentialEmergencyNumber: Telephony threw an exception.");

            return false;

        }

    }

    /**

import static org.mockito.Matchers.isNotNull;

import static org.mockito.Matchers.isNull;

import static org.mockito.Mockito.doReturn;

import static org.mockito.Mockito.doThrow;

import static org.mockito.Mockito.never;

import static org.mockito.Mockito.spy;

import static org.mockito.Mockito.verify;

import android.telecom.TelecomManager;

import android.telecom.VideoProfile;

import android.telephony.DisconnectCause;

import android.telephony.TelephonyManager;

import android.test.suitebuilder.annotation.SmallTest;

import com.android.server.telecom.Call;

        verify(mCall).disconnect(eq(0L));

    }

    /**

     * Ensure if {@link TelephonyManager#isPotentialEmergencyNumber(String)} throws an exception of

     * any sort that we don't crash Telecom.

     */

    @SmallTest

    @Test

    public void testThrowOnIsPotentialEmergencyNumber() {

        doThrow(new IllegalStateException()).when(mComponentContextFixture.getTelephonyManager())

                .isPotentialEmergencyNumber(anyString());

        testUnmodifiedRegularCall();

    }

    private ReceiverIntentPair regularCallTestHelper(Intent intent,

            Bundle expectedAdditionalExtras) {

        Uri handle = intent.getData();