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Unable to remove query parameters in visitor

See original GitHub issue

Describe the bug Unable to remove query parameters in visitor.

To Reproduce Attempted to remove query parameters using a visitor.

    'remove-hidden-parameters': () => {
      return {
        Parameter: {
          leave(parameter, ctx) {
            if (parameter['x-hidden']) {
              delete ctx.parent[ctx.key];
            }
          }
        }
      }

Expected behavior Expected query parameters with x-hidden: true to be removed.

Actual behavior

YAMLException: unacceptable kind of an object to dump [object Undefined]
    at writeNode (/usr/local/lib/node_modules/@redocly/openapi-cli/node_modules/js-yaml/lib/js-yaml/dumper.js:779:13)
    at writeBlockSequence (/usr/local/lib/node_modules/@redocly/openapi-cli/node_modules/js-yaml/lib/js-yaml/dumper.js:542:9)
    at writeNode (/usr/local/lib/node_modules/@redocly/openapi-cli/node_modules/js-yaml/lib/js-yaml/dumper.js:763:9)
    at writeBlockMapping (/usr/local/lib/node_modules/@redocly/openapi-cli/node_modules/js-yaml/lib/js-yaml/dumper.js:657:10)
    at writeNode (/usr/local/lib/node_modules/@redocly/openapi-cli/node_modules/js-yaml/lib/js-yaml/dumper.js:750:9)
    at writeBlockMapping (/usr/local/lib/node_modules/@redocly/openapi-cli/node_modules/js-yaml/lib/js-yaml/dumper.js:657:10)
    at writeNode (/usr/local/lib/node_modules/@redocly/openapi-cli/node_modules/js-yaml/lib/js-yaml/dumper.js:750:9)
    at writeBlockMapping (/usr/local/lib/node_modules/@redocly/openapi-cli/node_modules/js-yaml/lib/js-yaml/dumper.js:657:10)
    at writeNode (/usr/local/lib/node_modules/@redocly/openapi-cli/node_modules/js-yaml/lib/js-yaml/dumper.js:750:9)
    at writeBlockMapping (/usr/local/lib/node_modules/@redocly/openapi-cli/node_modules/js-yaml/lib/js-yaml/dumper.js:657:10) {
  reason: 'unacceptable kind of an object to dump [object Undefined]',
  mark: undefined
}

openapi-cli Version(s) What version of openapi-cli are you using? 1.0.0-beta.18

Node.js Version(s) v14.14.0