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StreamField: js error in adding component field

See original GitHub issue

Issue Summary

Error in back-office when trying to add items in a StreamField

Steps to Reproduce

Define a StreamField :

class EventPage(PublicationItemPage):
    """
    Simple event, providing:

    + date/time start
    + date/time end
    + location
    + audience
    + a signup link
    """
    #: Date from
    date_from = models.DateField(verbose_name=_('Start date'))

    #: Date to
    date_to = models.DateField(verbose_name=_('End date'),
                               null=True, blank=True,
                               help_text=_('Not required if event is on a single day'))

    #: Time from
    time_from = models.TimeField(verbose_name=_('Start time'), null=True, blank=True)

    #: Time to
    time_to = models.TimeField(verbose_name=_('End time'), null=True, blank=True)

    #: Audience can be `private` or `public`
    audience = models.CharField(verbose_name=_('Audience'), max_length=255, choices=EVENT_AUDIENCE_CHOICES)

    #: A Location
    location = models.ForeignKey('publications.Location',
                                 verbose_name=_('Location'),
                                 on_delete=models.SET_NULL,
                                 null=True, blank=True)

    #: A description of the event
    body = StreamField([('paragraph', blocks.RichTextBlock()),
                        ('image', ImageChooserBlock()),
                        ('url', blocks.URLBlock()),
                        ('date', blocks.DateBlock()),
                        ('page', blocks.PageChooserBlock())],
                       verbose_name=_('Body'),
                       null=True, blank=True)

Defines some content panels

# Content panels
    content_panels = [FieldPanel('title', classname="full title"),
                      FieldPanel('date_from'),
                      FieldPanel('date_to'),
                      FieldPanel('time_from'),
                      FieldPanel('time_to'),
                      FieldPanel('location'),
                      FieldPanel('audience'),
                      FieldPanel('signup_link'),
                      FieldPanel('body'), ]