Avoid KeyError on Pocket API parser

When trying to import my pocket library I got a lot of ` KeyError`  on Python. Pocket API has a few idiosyncrasies, such as sometimes returning the keys on json, sometimes not.

` ` ` sh
archivebox add --parser pocket_api pocket://my_username
` ` ` 

Gave me this errors
` ` ` 
  File "/app/archivebox/parsers/pocket_api.py", line 54, in link_from_article
    title = article['resolved_title'] or article['given_title'] or url
KeyError: 'resolved_title'
` ` ` 

This commit are the patches I've changed to successfully import my library

archivebox/parsers/pocket_api.py

@@ -47,11 +47,11 @@ def get_pocket_articles(api: Pocket, since=None, page=0):
 
 
 def link_from_article(article: dict, sources: list):
-    url: str = article['resolved_url'] or article['given_url']
+    url: str = articl.get('resolved_url') or article['given_url']
     broken_protocol = _BROKEN_PROTOCOL_RE.match(url)
     if broken_protocol:
         url = url.replace(f'{broken_protocol.group(1)}:/', f'{broken_protocol.group(1)}://')
-    title = article['resolved_title'] or article['given_title'] or url
+    title = article.get('resolved_title') or article.get('given_title') or url
 
     return Link(
         url=url,