- (BOOL)blankString{

    if (![self isKindOfClass:[NSString class]] ){

        return  YES;

    }

    if ([self isEqual:[NSNull null]]){

        return  YES;

    }

    if (self == NULL || [self isEqual:nil] || [self isEqual:Nil] || self == nil){

        return  YES;

    }

    if([self isEqualToString:@"(null)"]){

        return  YES;

    }

    if([self isEqualToString:@"<null>"]){

        return  YES;

    }

    if (self.length ==  || [[self stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] length] == ){

        return  YES;

    }

    return NO;

}