Ensure Dequeue is not attempted if buffer size is 0

Bonsai.Design/ObjectTextVisualizer.cs

@@ -37,7 +37,7 @@ protected override void ShowBuffer(IList<Timestamped<object>> values)
             var sb = new StringBuilder();
 
             // Trim old values if bufferSize was reduced
-            while (buffer.Count >= bufferSize)
+            while ((buffer.Count >= bufferSize) & (buffer.Count > 0))
                 buffer.Dequeue();
 
             // Add new values to the buffer (and only the ones which might appear)