Defect with framesets

[shawnmjones]

URI-M: https://web.archive.org/web/19961221032254/http://www.geocities.com:80/BourbonStreet/1389/

It looks like there is a <frame> element without a src attribute and the code does not recover from that.

Applicable Application log entries:

[2018-07-10 10:15:38,793 -0600 ] - INFO - [ https://web.archive.org/web/19961221032254/http://www.geocities.com:80/BourbonStreet/1389/ ]: mementoembed - Starting oEmbed surrogate creation process
[2018-07-10 10:15:38,793 -0600 ] - DEBUG - [ https://web.archive.org/web/19961221032254/http://www.geocities.com:80/BourbonStreet/1389/ ]: mementoembed - output format will be: json
[2018-07-10 10:15:40,779 -0600 ] - DEBUG - [ https://web.archive.org/web/19961221032254/http://www.geocities.com:80/BourbonStreet/1389/ ]: mementoembed.mementoresource - URI-M https://web.archive.org/web/19961221032254/http://www.geocities.com:80/BourbonStreet/1389/ matches the wayback pattern
[2018-07-10 10:15:41,804 -0600 ] - INFO - [ https://web.archive.org/web/19961221032254/http://www.geocities.com:80/BourbonStreet/1389/ ]: mementoembed.mementoresource - memento is a Wayback memento
[2018-07-10 10:15:41,828 -0600 ] - DEBUG - [ https://web.archive.org/web/19961221032254/http://www.geocities.com:80/BourbonStreet/1389/ ]: mementoembed.mementoresource.MementoResource - title is Sax on the Web; Harri Rautiainen's Saxophone Page
[2018-07-10 10:15:41,831 -0600 ] - ERROR - [ https://web.archive.org/web/19961221032254/http://www.geocities.com:80/BourbonStreet/1389/ ]: mementoembed - An unforeseen error has occurred
Traceback (most recent call last):
  File "/Volumes/nerfherder External/Unsynced-Projects/MementoEmbed/mementoembed/__init__.py", line 363, in oembed_endpoint
    httpcache
  File "/Volumes/nerfherder External/Unsynced-Projects/MementoEmbed/mementoembed/mementosurrogate.py", line 28, in __init__
    self.originalresource = OriginalResource(self.memento, self.httpcache)
  File "/Volumes/nerfherder External/Unsynced-Projects/MementoEmbed/mementoembed/originalresource.py", line 20, in __init__
    self.content = self.memento.content
  File "/Volumes/nerfherder External/Unsynced-Projects/MementoEmbed/mementoembed/mementoresource.py", line 428, in content
    content = self.get_content_from_frames()
  File "/Volumes/nerfherder External/Unsynced-Projects/MementoEmbed/mementoembed/mementoresource.py", line 331, in get_content_from_frames
    frameuri = frame['src']
  File "/Users/smj/.virtualenvs/MementoEmbed/lib/python3.6/site-packages/bs4/element.py", line 1011, in __getitem__
    return self.attrs[key]
KeyError: 'src'