fix(google): Fixed - TypeError: Cannot read properties of undefined (reading 'generationInfo') (#6756)

Author: pksharmapokhrel

libs/langchain-google-common/src/utils/gemini.ts

@@ -624,6 +624,11 @@ export function getGeminiAPI(config?: GeminiAPIConfig) {
     response: GoogleLLMResponse
   ): ChatGeneration[] {
     const parts = responseToParts(response);
+
+    if (parts.length === 0) {
+      return [];
+    }
+
     let ret = parts.map((part) => partToChatGeneration(part));
     if (ret.every((item) => typeof item.message.content === "string")) {
       const combinedContent = ret.map((item) => item.message.content).join("");