Add an exception for my_avatar id in AvatarProvider.
This fix a bug when the my_avatar file does not exist it is not created by
openFileHelper.
package net.java.otr4j.crypto;
import net.java.otr4j.OtrException;
@SuppressWarnings("serial")
public class OtrCryptoException extends OtrException {
public OtrCryptoException(Exception e) {
super(e);
}
}