Test code with Exceptions and with no exceptions at same time (JAVA)

I am writing a test for already built java class function. I am writing tests using Testng and Mockito and have a Data Provider.

This is my Test

@Test(dataProvider = "myProvider", dataProviderClass = StaticDataProvider.class,
        expectedExceptions = SomeException.class)

public void myControllerTest(String argument) throws Exception {
    // Mocked object bussiness\
    Boolean resultantObject = business.getList(argument);
    Assert.assertTrue(resultantObject);
}

This is my Controller which I want to test

public Boolean controller(String argument) {
    if(argument != null) {
        throw new someException();
    } else {
        System.out.println("Sucess");
        return true;
    }
}

This is my Data Providor

@DataProvider(name = "myProvider")
public static Object[][] getDirectoryList() throws Exception {
    Object[][] result = null;
    // case1 throws SomeException
    String testData1 = null;
    // case2 don't throw exception
    String testData2 = "String";
    result = new Object[][] { { testData1 }, { testData2 } };
    return result;
}

The problem here I am facing is, I don't want to create another test just to test both buggy and non buggy code and complete my test coverage using a single test case. But when I put Expected Exception on top, it fails on correct code, and when I dont, it fails on buggy code.

NOTE: This is example code and may not work, this is just to take an idea of scenario I am working on and what I am expecting.