Fixed endless generations in test_callback_one_string test

src/cpp/src/continuous_batching_impl.cpp

@@ -262,6 +262,9 @@ ContinuousBatchingPipeline::ContinuousBatchingImpl::generate(const std::vector<o
         }
     }, streamer);
 
+    OPENVINO_ASSERT(streamer_ptr == nullptr || input_ids.size() == 1 && (sampling_params[0].is_greedy_decoding() || sampling_params[0].is_multinomial()),
+        "Currently streaming is possible only with batch size=1 and only for greedy or multinomial decoding");
+
     std::vector<GenerationHandle> generations;
     for (size_t request_id = 0; request_id < input_ids.size(); ++request_id) {
         OPENVINO_ASSERT(1 == input_ids[request_id].get_shape().at(0), "Use multiple tensors to pass a batch.");
@@ -283,7 +286,7 @@ ContinuousBatchingPipeline::ContinuousBatchingImpl::generate(const std::vector<o
         m_requests.clear();
     };
 
-    bool continue_generation = true, step_throws_exception = false;
+    bool continue_generation = true;
     while (has_non_finished_requests() && continue_generation) {
         try {
             step();