Use a random transcription of an element when more than one found

Closes #112 (closed)

dan/datasets/extract/exceptions.py

@@ -49,15 +49,6 @@ class NoTranscriptionError(ElementProcessingError):
         return f"No transcriptions found on element ({self.element_id}) with this config. Skipping."
 
 
-class MultipleTranscriptionsError(ElementProcessingError):
-    """
-    Raised when there are more than one transcription on an element
-    """
-
-    def __str__(self) -> str:
-        return f"More than one transcription found on element ({self.element_id}) with this config."
-
-
 class UnknownLabelError(ProcessingError):
     """
     Raised when the specified label is not known