update tests to be compatiable with streaming operations without events

private/model/api/eventstream.go

@@ -208,7 +208,7 @@ func setupEventStream(topShape *Shape) *EventStream {
 			eventRef.Shape.EventFor = append(eventRef.Shape.EventFor, eventStream)
 
 			// Exceptions and events are two different lists to allow the SDK
-			// to easly generate code with the two handled differently.
+			// to easily generate code with the two handled differently.
 			event := &Event{
 				Name:  eventRefName,
 				Shape: eventRef.Shape,
@@ -974,14 +974,16 @@ func (c *loopReader) Read(p []byte) (int, error) {
 			t.Fatalf("expect no error got, %v", err)
 		}
 
-		// Assert calling Err before close does not close the stream.
-		resp.{{ $esMemberName }}.Err()
-		select {
-		case _, ok := <-resp.{{ $esMemberName }}.Events():
-			if !ok {
-				t.Fatalf("expect stream not to be closed, but was")
+		if len(eventMsgs) != 0 {
+			// Assert calling Err before close does not close the stream.
+			resp.{{ $esMemberName }}.Err()
+			select {
+			case _, ok := <-resp.{{ $esMemberName }}.Events():
+				if !ok {
+					t.Fatalf("expect stream not to be closed, but was")
+				}
+			default:
 			}
-		default:
 		}
 
 		resp.{{ $esMemberName }}.Close()