Exception not caught in custom mobile app

Using the mobile SDK, I have written a custom mobile app for Windows.

When I try to run a server workflow, I can't seem to catch any exceptions that may occur. For instance, if the workflow server cannot be found, an HttpRequestException is raised, and the application shows a messagebox with the stacktrace. But in this particular case, I want to catch all exceptions, and silently continue. How can I do that?

My code is basically this:

if (!await _networkOperations.HasConnection.ExecuteAsync())
{
    return; // no network at all, don't bother trying
}


try
{
    var workflowArgs = new WorkflowArgs { Url = "https://myserver/portal/home/item.html?id=9196d1ff94bd4c0eb5f61a6fc84f9aaa" };
    // Exception may be raised on the following line:
    var result = await _workflowOperations.Run.ExecuteAsync(workflowArgs);    
}
catch (Exception)
{
    // I never get here
}

It doesn't matter if I call Run.Execute() or await Run.ExecuteAsync(), in both cases the catch block is never reached.

This is what the application shows:

(roughly translates to: "Error executing workflow, the text that belongs to this error code cannot be found. The name or address of the server cannot be resolved")