Hotfix for #215

Changelog

• [fixed] Undefined variable 'labelset' in Labels.decoding_label_list (#215)

src/taggingbackends/data/labels.py

@@ -343,8 +343,8 @@ class Labels:
     """
     @property
     def decoding_label_list(self):
-        labelspec = self.decodingspec
-        if labelspec is None:
+        labelset = self.decodingspec
+        if labelset is None:
             return self.encoding_label_list
         if self.secondarylabelspec:
             labelset = labelset + self.secondarylabelspec