Fix up a few exceptions

app/services/fetch_remote_account_service.rb

@@ -19,6 +19,8 @@ class FetchRemoteAccountService < BaseService
     Rails.logger.debug "Going to webfinger #{username}@#{domain}"
 
     return FollowRemoteAccountService.new.call("#{username}@#{domain}")
+  rescue TypeError => e
+    Rails.logger.debug "Unparseable URL given: #{url}"
   rescue Nokogiri::XML::XPath::SyntaxError
     Rails.logger.debug "Invalid XML or missing namespace"
   end

app/services/process_feed_service.rb

@@ -100,9 +100,14 @@ class ProcessFeedService < BaseService
 
       next unless media.nil?
 
+      begin
         media = MediaAttachment.new(account: status.account, status: status, remote_url: enclosure_link.attribute('href').value)
         media.file_remote_url = enclosure_link.attribute('href').value
         media.save
+      rescue Paperclip::Errors::NotIdentifiedByImageMagickError
+        Rails.logger.debug "Error saving attachment from #{enclosure_link.attribute('href').value}"
+        next
+      end
     end
   end
 
@@ -213,7 +218,7 @@ class ProcessFeedService < BaseService
   end
 
   def target_url(xml)
-    xml.at_xpath('.//activity:object').at_xpath('./xmlns:link[@rel="alternate"]', activity: ACTIVITY_NS).attribute('href').value
+    xml.at_xpath('.//activity:object', activity: ACTIVITY_NS).at_xpath('./xmlns:link[@rel="alternate"]').attribute('href').value
   end
 
   def object_type(xml)