use babylon7 parse javascript: Cannot read property 'map' of undefined

[peakchen90]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Choose language: Javascript
2. Choose parser: babylon7
3. Type var a = 1 in the left editor
4. See error: Cannot read property 'map' of undefined

Expected behavior
Don't throw an error

Screenshots
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Browser (please complete the following information):

• OS: Mac OS 10.14.6
• Chrome 77

astexplorer settings:

• Selected parser: babylon7
• Selected transformer (if applicable): none
• Contents of the local storage key explorerSettingsV1 (code can be removed if you don't want it to be public)

{"showTransformPanel":false,"parserSettings":{"babylon7":{}},"parserPerCategory":{"javascript":"babylon7","htmlmixed":"vue"},"workbench":{"parser":"babylon7","code":"var a = 1","keyMap":"default","transform":{"code":"export default function (babel) {\n  const { types: t } = babel;\n  \n  return {\n    name: \"ast-transform\", // not required\n    visitor: {\n      Identifier(path) {\n        path.node.name = path.node.name.split('').reverse().join('');\n      }\n    }\n  };\n}\n","transformer":"babelv7"}}}

Additional context
Add any other context about the problem here.

[peakchen90]

I just clear all localStorage, it works. 😆