Shaman changed response does-not-exist → file-unknown

Instead of 'does-not-exist' we'll now receive 'file-unknown' (see Shaman
commit 44efa6b39bddc703a14aa68316b092866813c38a)

blender_asset_tracer/pack/shaman/transfer.py

@@ -30,6 +30,9 @@ import blender_asset_tracer.pack.transfer as bat_transfer
 MAX_DEFERRED_PATHS = 8
 MAX_FAILED_PATHS = 8
 
+response_file_unknown = "file-unknown"
+response_already_uploading = "already-uploading"
+
 
 class FileInfo:
     def __init__(self, checksum: str, filesize: int, abspath: pathlib.Path):
@@ -204,9 +207,9 @@ class ShamanTransferrer(bat_transfer.FileTransferer):
                 self.error_set(msg)
                 return None
 
-            if response == 'does-not-exist':
+            if response == response_file_unknown:
                 to_upload.appendleft(path)
-            elif response == 'already-uploading':
+            elif response == response_already_uploading:
                 to_upload.append(path)
             elif response == 'ERROR':
                 msg = 'Error from Shaman: %s' % path