Fix the issue #124 (Add the changeset) (#293)

* Fix the issue #124

* Add changeset change.

Author: junyanxu

.changeset/funny-paws-visit.md

@@ -0,0 +1,5 @@
+---
+"@google/generative-ai": patch
+---
+
+Make sure chat api do not send empty text request after encounter any server error that returns empty response. This fixes issue #124 and issue #286.