Retrying fetch the calendar after an error

[JPZV]

There would be a more elegant solution, like checking the err.retry property, but anyway this will fix the calendar stop being updated after an error occurred, like an ECONNRESET

[randomBrainstormer]

I'll agree there should be better error handling, it does look like improvement for retrying. I'll proceed with the merge. Thank you for opening the MR!