do not send confidence=None in the payload

closes #95 (closed)

arkindex_worker/worker/entity.py

@@ -109,16 +109,19 @@ class EntityMixin(object):
             )
             return
 
+        body = {
+            "entity": entity,
+            "length": length,
+            "offset": offset,
+            "worker_version_id": self.worker_version_id,
+        }
+        if confidence is not None:
+            body["confidence"] = confidence
+
         transcription_ent = self.request(
             "CreateTranscriptionEntity",
             id=transcription,
-            body={
-                "entity": entity,
-                "length": length,
-                "offset": offset,
-                "worker_version_id": self.worker_version_id,
-                "confidence": confidence,
-            },
+            body=body,
         )
         # TODO: Report transcription entity creation