[ML] Failed to import calendar events using .ics

[hendry-lim]

Kibana version: 7.9.0-SNAPSHOT

Elasticsearch version: 7.9.0-SNAPSHOT

Browser version: Firefox 79.0

Original install method (e.g. download page, yum, from source, etc.): Docker

Describe the bug:
Unable to import public holiday calendar events contained in an .ics file.

Steps to reproduce:

1. In Kibana, go to Machine Learning --> Settings
2. Click Create under Calendars
3. Click Import events
4. Select the .ics file

Expected behavior:
There should not be any error parsing the .ics file. The calendar events contained in the .ics file should be processed and uploaded successfully.

Screenshots (if relevant):

Errors in browser console (if relevant):

Could not parse ICS file. 
{…}
​
stack: ""
​
<prototype>: Object { stack: "", … }
ml.plugin.js:43:1478066

Any additional context:
This is the .ics that was used public-holidays-sg-2020.ics

[elasticmachine]

Pinging @elastic/ml-ui (:ml)