Submission without data was possible in Test

BasicUnitTest/SenderTests.cs

@@ -83,6 +83,7 @@ public class SenderTests {
     public void VerifyMetaData_ValidData_Fine() {
         // Arrange
         var submission = new Submission();
+        submission.Data = @"{""data"":""value""}";
         submission.ServiceType.Identifier = leikaKey;
 
         // Act
@@ -98,6 +99,7 @@ public class SenderTests {
     public void VerifyMetaData_MissingLeikaKey_ThrowsAnError() {
         // Arrange
         var submission = new Submission();
+        submission.Data = @"{""data"":""value""}";
 
         // Act
         var metadata = Sender.CreateMetadata(submission);