parser/ner: do not currently support returning activations

spacy/pipeline/transition_parser.pyx

@@ -667,3 +667,9 @@ cdef class Parser(TrainablePipe):
                 if state.is_final():
                     break
         return states, golds, max_length
+
+    @property
+    def activations(self):
+        # We currently do not have access to the state ids or probabilities
+        # after parsing. TODO: the parser refactor does provide some history.
+        return []