Retokenizer.merge() failing if doc.tensor set in v2.1.0a7

[NixBiks]

Reproducible example

from spacy import displacy
import spacy

nlp = spacy.load('en')
text = 'Hello World! When is this breaking?'

displacy.serve(nlp(text))

Traceback

Traceback (most recent call last):
  File "/home/bjerre/Projects/plx/InternalWebApp/venv/lib/python3.6/site-packages/IPython/core/interactiveshell.py", line 3267, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-3-d0297177ff7d>", line 7, in <module>
    displacy.serve(nlp(text))
  File "/home/bjerre/Projects/plx/InternalWebApp/venv/lib/python3.6/site-packages/spacy/displacy/__init__.py", line 80, in serve
    render(docs, style=style, page=page, minify=minify, options=options, manual=manual)
  File "/home/bjerre/Projects/plx/InternalWebApp/venv/lib/python3.6/site-packages/spacy/displacy/__init__.py", line 42, in render
    parsed = [converter(doc, options) for doc in docs] if not manual else docs
  File "/home/bjerre/Projects/plx/InternalWebApp/venv/lib/python3.6/site-packages/spacy/displacy/__init__.py", line 42, in <listcomp>
    parsed = [converter(doc, options) for doc in docs] if not manual else docs
  File "/home/bjerre/Projects/plx/InternalWebApp/venv/lib/python3.6/site-packages/spacy/displacy/__init__.py", line 132, in parse_deps
    retokenizer.merge(span, attrs=attrs)
  File "_retokenize.pyx", line 73, in spacy.tokens._retokenize.Retokenizer.__exit__
  File "_retokenize.pyx", line 225, in spacy.tokens._retokenize._bulk_merge
KeyError: 0

Info about spaCy

• spaCy version: 2.1.0a7
• Platform: Linux-4.15.0-45-generic-x86_64-with-Ubuntu-18.04-bionic
• Python version: 3.6.7
• Models: en

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