Uncaught TypeError: Cannot read property 'trim' of undefined

When generating comments for a file with existing comments, the plugin throws uncaught exception.

Sample .sol file:

contract SolidityCommentFails {`
  //
  // Long Comment
  //
  function failsOnLongComments() {}
}

Exception:
Uncaught TypeError: Cannot read property 'trim' of undefined

TypeError: Cannot read property 'trim' of undefined
at ContractComment.hasComment (/home/nikolay/.atom/packages/solidity-comments/node_modules/@nodefactory/solidity-comments-core/dist/lib/contract/contract-comment.js:165:22)
at ContractComment.updateComment (/home/nikolay/.atom/packages/solidity-comments/node_modules/@nodefactory/solidity-comments-core/dist/lib/contract/contract-comment.js:46:16)
at ContractComment.insertComment (/home/nikolay/.atom/packages/solidity-comments/node_modules/@nodefactory/solidity-comments-core/dist/lib/contract/contract-comment.js:38:16)
at Object.visitors.(anonymous function) [as ContractDefinition] (/home/nikolay/.atom/packages/solidity-comments/node_modules/@nodefactory/solidity-comments-core/dist/index.js:52:25)
at visit (/home/nikolay/.atom/packages/solidity-comments/node_modules/solidity-parser-antlr/dist/index.js:106:30)
at /home/nikolay/.atom/packages/solidity-comments/node_modules/solidity-parser-antlr/dist/index.js:97:14
at Array.forEach ()
at visit (/home/nikolay/.atom/packages/solidity-comments/node_modules/solidity-parser-antlr/dist/index.js:96:10)
at Object.visit (/home/nikolay/.atom/packages/solidity-comments/node_modules/solidity-parser-antlr/dist/index.js:113:7)
at generate (/home/nikolay/.atom/packages/solidity-comments/node_modules/@nodefactory/solidity-comments-core/dist/index.js:43:33)
at generateCommentsFromText (/home/nikolay/.atom/packages/solidity-comments/node_modules/@nodefactory/solidity-comments-core/dist/index.js:28:10)
at Object.run (/home/nikolay/.atom/packages/solidity-comments/lib/atom-solidity-comments.js:29:25)
at HTMLElement.atomSolidityCommentsToggle (/home/nikolay/.atom/packages/solidity-comments/lib/atom-solidity-comments.js:19:51)
at CommandRegistry.handleCommandEvent (/usr/share/atom/resources/app/static/:11:350055)
at KeymapManager.t.exports.KeymapManager.dispatchCommandEvent (/usr/share/atom/resources/app/static/:11:1230760)
at KeymapManager.t.exports.KeymapManager.handleKeyboardEvent (/usr/share/atom/resources/app/static/:11:1226894)
at WindowEventHandler.handleDocumentKeyEvent (/usr/share/atom/resources/app/static/:11:285234)