control-service: fix concatAddresses NPE

[mivanov1988]

This change aims to fix the NPE when null is passed to EmailNotification.concatAddresses().

Testing done: unit tests

Signed-off-by: Miroslav Ivanov [email protected]

[antoniivanov]

This is crying for unit tests, I think :)

And I find it a good practice to have a test for each bug we fix. Bug tend to re-surface (unless we check for them). I'd usually even write the test before I make the fix (thus helping me write the fix faster and making sure I have a good test).

[mivanov1988]

This is crying for unit tests, I think :)

And I find it a good practice to have a test for each bug we fix. Bug tend to re-surface (unless we check for them). I'd usually even write the test before I make the fix (thus helping me write the fix faster and making sure I have a good test).

The whole class is crying for unit tests, but such have not been implemented :)

[mivanov1988]

This is crying for unit tests, I think :)

And I find it a good practice to have a test for each bug we fix. Bug tend to re-surface (unless we check for them). I'd usually even write the test before I make the fix (thus helping me write the fix faster and making sure I have a good test).

Added tests.