`toMarkdown` not working as expected for nodes with type `variable`

[accordproject]

`toMarkdown` not working as expected for nodes with type `variable`

[dselman]

I can't reproduce this. I added a test for it here:
https://github.com/accordproject/cicero-ui/blob/master/src/plugins/ClausePlugin.test.js

The snapshot contains the embedded variables.

\`\`\` <clause src=ap://[email protected]#b8eae2fb3c2571284b4dcfc1fc348d8234d0c5db158962043720828be2eb9085 clauseid=d3cdb02e-6982-47a1-9ba3-350d46212b63>
Acceptance of Delivery. <variable id=\\"shipper\\" value=\\"%22Party%20A%22\\"/> will be deemed to have completed its delivery obligations if in <variable id=\\"receiver\\" value=\\"%22Party%20B%22\\"/>'s opinion, the <variable id=\\"deliverable\\" value=\\"%22Widgets%22\\"/> satisfies the Acceptance Criteria, and <variable id=\\"receiver\\" value=\\"%22Party%20B%22\\"/> notifies <variable id=\\"shipper\\" value=\\"%22Party%20A%22\\"/> in writing that it is accepting the <variable id=\\"deliverable\\" value=\\"%22Widgets%22\\"/>.

Inspection and Notice. <variable id=\\"receiver\\" value=\\"%22Party%20B%22\\"/> will have <variable id=\\"businessDays\\" value=\\"10\\"/> Business Days' to inspect and evaluate the <variable id=\\"deliverable\\" value=\\"%22Widgets%22\\"/> on the delivery date before notifying <variable id=\\"shipper\\" value=\\"%22Party%20A%22\\"/> that it is either accepting or rejecting the <variable id=\\"deliverable\\" value=\\"%22Widgets%22\\"/>.

Acceptance Criteria. The \\"Acceptance Criteria\\" are the specifications the <variable id=\\"deliverable\\" value=\\"%22Widgets%22\\"/> must meet for the <variable id=\\"shipper\\" value=\\"%22Party%20A%22\\"/> to comply with its requirements and obligations under this agreement, detailed in <variable id=\\"attachment\\" value=\\"%22Attachment%20X%22\\"/>, attached to this agreement.
\`\`\`