bugfix for TranslationWrapperPipeline (#3290)

* bugfix for TranslationWrapperPipeline

* Update standard_pipelines.py

* Update haystack/pipelines/standard_pipelines.py

Co-authored-by: Sara Zan <[email protected]>

Author: nickchomey

haystack/pipelines/standard_pipelines.py

@@ -596,7 +596,10 @@ def __init__(
         if isinstance(pipeline, QuestionAnswerGenerationPipeline):
             setattr(output_translator, "run", output_translator.run_batch)
 
-        graph = pipeline.pipeline.graph
+        if hasattr(pipeline, "pipeline"):
+            graph = pipeline.pipeline.graph
+        else:
+            graph = pipeline.graph  # type: ignore
         previous_node_name = ["InputTranslator"]
         # Traverse in BFS
         for node in graph.nodes: