Remove dataset.with_empty_annotations() to keep original input structure (#1964)

Remove dataset.with_empty_annotations() call to keep original input structure

Author: Songki Choi

otx/algorithms/classification/tasks/inference.py

@@ -127,7 +127,6 @@ def infer(
         logger.info("called infer()")
         stage_module = "ClsInferrer"
         self._data_cfg = self._init_test_data_cfg(dataset)
-        dataset = dataset.with_empty_annotations()
 
         dump_features = True
         dump_saliency_map = not inference_parameters.is_evaluation if inference_parameters else True
@@ -169,7 +168,6 @@ def explain(
         logger.info("called explain()")
         stage_module = "ClsExplainer"
         self._data_cfg = self._init_test_data_cfg(dataset)
-        dataset = dataset.with_empty_annotations()
 
         results = self._run_task(
             stage_module,