fix tests?

Author: sestinj

core/llm/openaiTypeConverters.ts

@@ -190,20 +190,24 @@ export function fromChatCompletionChunk(
       content: delta.content,
     };
   } else if (delta?.tool_calls) {
-    return {
-      role: "assistant",
-      content: "",
-      toolCalls: delta?.tool_calls
-        .filter((tool_call) => !tool_call.type || tool_call.type === "function")
-        .map((tool_call) => ({
-          id: tool_call.id,
-          type: "function" as const,
-          function: {
-            name: (tool_call as any).function?.name,
-            arguments: (tool_call as any).function?.arguments,
-          },
-        })),
-    };
+    const toolCalls = delta?.tool_calls
+      .filter((tool_call) => !tool_call.type || tool_call.type === "function")
+      .map((tool_call) => ({
+        id: tool_call.id,
+        type: "function" as const,
+        function: {
+          name: (tool_call as any).function?.name,
+          arguments: (tool_call as any).function?.arguments,
+        },
+      }));
+    
+    if (toolCalls.length > 0) {
+      return {
+        role: "assistant",
+        content: "",
+        toolCalls,
+      };
+    }
   }
 
   return undefined;