allow null usage for open ai models

Signed-off-by: jonghoon park <[email protected]>

Author: dev-jonghoonpark

models/spring-ai-openai/src/main/java/org/springframework/ai/openai/OpenAiChatModel.java

@@ -467,6 +467,10 @@ private OpenAiApi.ChatCompletion chunkToChatCompletion(OpenAiApi.ChatCompletionC
 	}
 
 	private DefaultUsage getDefaultUsage(OpenAiApi.Usage usage) {
+		if (usage == null) {
+			logger.warn("No usage returned for request");
+			return null;
+		}
 		return new DefaultUsage(usage.promptTokens(), usage.completionTokens(), usage.totalTokens(), usage);
 	}
 

models/spring-ai-openai/src/main/java/org/springframework/ai/openai/OpenAiEmbeddingModel.java

@@ -184,6 +184,10 @@ public EmbeddingResponse call(EmbeddingRequest request) {
 	}
 
 	private DefaultUsage getDefaultUsage(OpenAiApi.Usage usage) {
+		if (usage == null) {
+			logger.warn("No usage returned for request");
+			return null;
+		}
 		return new DefaultUsage(usage.promptTokens(), usage.completionTokens(), usage.totalTokens(), usage);
 	}