Treat null as zero for session durations

If a session has a null duration, treat it as zero to fix deserialization exception.

Author: martincostello

src/MartinCostello.BrowserStack.Automate/Session.cs

@@ -26,7 +26,7 @@ public class Session : IBrowserInfo
         /// <summary>
         /// Gets or sets the duration of the session in seconds.
         /// </summary>
-        [JsonProperty("duration")]
+        [JsonProperty("duration", NullValueHandling = NullValueHandling.Ignore)] // TODO Should be nullable, but don't want to break binary compatibility
         public int Duration { get; set; }
 
         /// <summary>

tests/MartinCostello.BrowserStack.Automate.Tests/BrowserStackAutomateClientTests.cs

@@ -978,7 +978,7 @@ private static void AssertSession(Session session, string expectedName)
             session.ProjectName.Should().NotBeNullOrEmpty();
             session.Reason.Should().NotBeNullOrEmpty();
             session.Status.Should().NotBeNullOrEmpty();
-            session.Duration.Should().BeGreaterThan(0);
+            session.Duration.Should().BeGreaterThan(-1);
         }
 
         /// <summary>