In the function "perform_request_alert", now passing the "sendmail" function of the smtplib.SMTP object a list of recipients instead of a comma-separated string containing multiple recipients.
In the function "perform_request_alert", now passing the "sendmail" function
of the smtplib.SMTP object a list of recipients instead of a comma-separated
string containing multiple recipients.

tiborsimko/invenio,inveniosoftware/invenio,tiborsimko/invenio,inveniosoftware/invenio