Calendar: iCal events with errors prevent whole calendar loading

[castaway]

Describe the bug Events created outside of Runbox7 might contain content that Runbox7 cannot parse. If those exist then the entire calendar does not load. Errors for example: Object { message: "Missing parameter value in 'DESCRIPTION;ALTREP are seen in the console. No errors are seen by the user.

Expected behavior All parseable events should be loaded in the calendar, any that wont parse should produce an error message we can use to help the user fix the issue or report it to us.