draftToHtml crashes with empty line from state

An empty line inserted from the editor results in a crash of the application.

Example DraftJS content state:

{
    "blocks": [
      {
        "data": [
          
        ],
        "depth": 0,
        "entityRanges": [
          
        ],
        "inlineStyleRanges": [
          
        ],
        "key": "8r1pn",
        "text": "Header",
        "type": "header-two"
      },
      {
        "data": [
          
        ],
        "depth": 0,
        "entityRanges": [
          
        ],
        "inlineStyleRanges": [
          {
            "length": 3,
            "offset": 5,
            "style": "BOLD"
          }
        ],
        "key": "o7di",
        "text": "Test",
        "type": "unstyled"
      },
      {
        "data": [
          
        ],
        "depth": 0,
        "entityRanges": [
          
        ],
        "inlineStyleRanges": [
          
        ],
        "key": "fjqu1",
        "text": null,
        "type": "unstyled"
      }
    ],
    "entityMap": [
      
    ]
  }

draftToHtml function with this state yields this error:

Uncaught TypeError: Cannot read property 'length' of null
    at getSections (draftjs-to-html.js:158)
    at getBlockInnerMarkup (draftjs-to-html.js:569)
    at getBlockMarkup (draftjs-to-html.js:610)
    at draftjs-to-html.js:703
    at Array.forEach (<anonymous>)
    at draftToHtml (draftjs-to-html.js:692)
    at index.js:14
    at commitHookEffectListMount (react-dom.development.js:19764)
    at commitPassiveHookEffects (react-dom.development.js:19802)
    at HTMLUnknownElement.callCallback (react-dom.development.js:188)
    at Object.invokeGuardedCallbackDev (react-dom.development.js:237)
    at invokeGuardedCallback (react-dom.development.js:292)
    at flushPassiveEffectsImpl (react-dom.development.js:22884)
    at unstable_runWithPriority (scheduler.development.js:653)
    at runWithPriority$1 (react-dom.development.js:11061)
    at flushPassiveEffects (react-dom.development.js:22851)
    at react-dom.development.js:22730
    at workLoop (scheduler.development.js:597)
    at flushWork (scheduler.development.js:552)
    at MessagePort.performWorkUntilDeadline (scheduler.development.js:164)

Start at getSections in draftjs-to-html.js:158 and trace the call from draftToHtml shown in the stack trace. Reproduce the failure with the supplied DraftJS content state, then verify that an unstyled block with null text no longer crashes draftToHtml and produces HTML.