[BUG] AiServices with tool execution supports response as message or tool execution, but not both

[SteveMartinBIL]

Hello there

I am implementing LangChain4J in a Spring boot java project, with AI Services.
It's working pretty well, but I have a case where the model answer a text message like "Please wait I am retrieving some information for you" and ask for a tool execution. In this case, le tool execution is ignored (cf

langchain4j/langchain4j-azure-open-ai/src/main/java/dev/langchain4j/model/azure/InternalAzureOpenAiHelper.java

Line 267 in abc957a

if (chatResponseMessage.getContent() != null) {

)

Describe the bug
For me, it should execute the function first, or give the possibility to have the choice.

To Reproduce
Create an AI Service with tool execution and ask for something like "retrieve my todo list"

Expected behavior
The function should be executed instead of returning the text message from the model.

Please complete the following information:

• LangChain4j version: 0.31.0
• LLM(s) used: Azure OpenAI gpt-4o
• Java version: 17
• Spring Boot version (if applicable): 3.1.11

Thank you for your work, this lib is great :)

@SteveMartinBIL thanks a lot for reporting! Fixing it right now.

cc @agoncal @jdubois