Prevent NPE in case of null temperature/topP

[KaiSuchomel]

We found the following NPE in our Log:

2025-08-22 11:21:50,801 WARN  [io.qua.lan.gem.com.GeminiChatLanguageModel] (efbdd8b9a7a18d1f1b062854ad2071a4::) Exception while calling model listener: java.lang.NullPointerException: Cannot invoke "java.lang.Double.doubleValue()" because the return value of "dev.langchain4j.model.chat.request.ChatRequestParameters.temperature()" is null
	at io.quarkiverse.langchain4j.runtime.listeners.SpanChatModelListener.onRequest(SpanChatModelListener.java:53)
	at io.quarkiverse.langchain4j.gemini.common.GeminiChatLanguageModel.lambda$chat$0(GeminiChatLanguageModel.java:80)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
	at io.quarkiverse.langchain4j.gemini.common.GeminiChatLanguageModel.chat(GeminiChatLanguageModel.java:78)
	at dev.langchain4j.model.chat.ChatModel_CAOdzSz_JXOmbdPru8SBVdBro64_Synthetic_ClientProxy.chat(Unknown Source)

Added Null Check

[quarkus-bot]

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It should be safe to merge provided you have a look at the other checks in the summary.

[KaiSuchomel]

@geoand @jmartisk When will the new/next release be available?

[geoand]

Likely some time this week

[geoand]

1.1.2 was released and contains this fix