No Error when message fails due to no data

[tomfotherby]

Here is a test case:

    // Set a valid domain key
    Apostle::setup("valid-key-entered-here");

    // Create a mail instance. Ensure the mail template used doesn't need any data
    $mail = new Mail( "welcome", ["email" => "tom@example.com" ] );

    // Send to Apostle.io
    $result = $mail->deliver($failureMsg);

    echo $result ? "all ok" : "Something failed: $failureMsg\n";

It prints "all ok".

There are 3 problems happening:

1. The message fails to be delivered even though it's valid.
2. The delivery returns true, but should be false.
3. The apostle.io web-console shows the wrong delivery failure message.

The apostle.io web-console shows the following reason for failing:

Failed to hydrate template, check your template and data variables match

However this isn't a true error message because my "welcome" template (which I edited from the demo) doesn't have any template variables.

If you thern add any data item, even if the template doesn't need any, the mail will send ok.

    $mail->anythinghere = "any value";

So it seems apostle needs some data, even if not used, before it'll send.