Change default behaviour on MetaDataException (#90)

Error occurs when tenant or namespace does not exist.
org.apache.pulsar.broker.web.RestException: Policies not found for tenant/namespace namespace
diff --git a/src/DotPulsar/Internal/DefaultExceptionHandler.cs b/src/DotPulsar/Internal/DefaultExceptionHandler.cs
index a783827..c064153 100644
--- a/src/DotPulsar/Internal/DefaultExceptionHandler.cs
+++ b/src/DotPulsar/Internal/DefaultExceptionHandler.cs
@@ -45,7 +45,7 @@
                 TooManyRequestsException _ => FaultAction.Retry,
                 ChannelNotReadyException _ => FaultAction.Retry,
                 ServiceNotReadyException _ => FaultAction.Retry,
-                MetadataException _ => FaultAction.Retry,
+                MetadataException _ => FaultAction.Rethrow,
                 ConsumerNotFoundException _ => FaultAction.Retry,
                 ConnectionDisposedException _ => FaultAction.Retry,
                 AsyncLockDisposedException _ => FaultAction.Retry,