Handle optional audio path in the dialog.to_audio() method

Author: sergioburdisso

src/sdialog/__init__.py

@@ -466,7 +466,7 @@ def to_file(self, path: str = None, type: str = "auto",
 
     def to_audio(
         self,
-        path: str,
+        path: str = None,
         **kwargs: dict
     ):
         """
@@ -530,7 +530,8 @@ def to_audio(
         except Exception:
             raise Exception("The audio module is not installed. Please install it with `pip install sdialog[audio]`")
 
-        kwargs["dir_audio"] = path
+        if path is not None:
+            kwargs["dir_audio"] = path
 
         return to_audio(
             self,

src/sdialog/audio/pipeline.py

@@ -594,7 +594,7 @@ def inference(
                 ))
 
             # Override the dialog directory name if provided otherwise use the dialog id as the directory name
-            dialog_directory = dialog_dir_name or ""
+            dialog_directory = dialog_dir_name or str(dialog.id) or ""
             dialog.audio_dir_path = self.dir_audio
 
             dialog.audio_step_1_filepath = os.path.join(