Align handling of empty choices. (#179)

Co-authored-by: Jonas Israel <[email protected]>

Author: Jonas-Isr

foundation-models/openai/src/main/java/com/sap/ai/sdk/foundationmodels/openai/model/OpenAiChatCompletionOutput.java

@@ -40,9 +40,7 @@ public class OpenAiChatCompletionOutput extends OpenAiCompletionOutput
    */
   @Nonnull
   public String getContent() throws OpenAiClientException {
-    if (getChoices().isEmpty()) {
-      return "";
-    }
+    //    We expect choices to be defined and never empty.
     if ("content_filter".equals(getChoices().get(0).getFinishReason())) {
       throw new OpenAiClientException("Content filter filtered the output.");
     }