No toISOString function in exdate[name]

[runely]

This is thrown when an EXDATE is date only: EXDATE:20400116

TypeError: No toISOString function in exdate[name]
    at /node_modules/node-ical/ical.js:278:17
    at Array.forEach (<anonymous>)
    at Object.EXDATE (/node_modules/node-ical/ical.js:270:11)
    at Object.handleObject (/node_modules/node-ical/ical.js:521:39)
    at Object.parseLines (/node_modules/node-ical/ical.js:575:18)
    at Object.parseICS (/node_modules/node-ical/ical.js:628:12)
    at Request._callback (/node_modules/node-ical/node-ical.js:114:12)
    at Request.self.callback (/node_modules/request/request.js:185:22)
    at Request.emit (events.js:311:20)
    at Request.EventEmitter.emit (domain.js:482:12)

[runely]

Added a PR with an ics file so there can be made a test, and this issue can be resolved

[camrun91]

@jens-maus I can confirm I am getting this same error.

[runely]

@jens-maus In this latest version, 0.12.7, this problem has come to the surface because the error is now thrown instead of logged to the console: replace all console.error() with proper "throw Error" returns to return

[runely]

Updated the PR with a fix that works with the invalid calendar as well as all my calendars

[jens-maus]

Thanks for the PR. Merge it now after having applied a small fix/improvement.