Add test for URL: feedville.com,2007-06-19:/blends/16171

[dentarg]

From https://app.getsentry.com/twingly-1/staging-zambezi/group/16231292/ (not sure that that link will work forever, we only have events from the last 30 days at Sentry IIRC)

Addressable::URI::InvalidURIError: Cannot assemble URI string with ambiguous path: 'feedville.com,2007-06-19:/blends/16171'

The raw stacktrace:

Stacktrace (most recent call first):

  addressable/uri.rb:2167:in `to_s'
    raise InvalidURIError,
  /home/deploy/twingly-staging-zambezi/releases/20140305193534/lib/converter.rb:93:in `remove_scheme_from_url'
    uri.to_s
  /home/deploy/twingly-staging-zambezi/releases/20140305193534/lib/converter.rb:81:in `id_for_blog'
    blog_url_without_scheme = remove_scheme_from_url(blog_url)
  /home/deploy/twingly-staging-zambezi/releases/20140305193534/lib/replicator.rb:23:in `replicate_blog'
    blog_id = Converter.id_for_blog(mysql_row[:WebsiteUrl])
  /home/deploy/twingly-staging-zambezi/releases/20140305193534/lib/replicator.rb:15:in `replicate'
    replicate_blog(action, mysql_row)
  zambezi.rb:26:in `block (2 levels) in <main>'
    replicator.replicate(document[:action], document[:type], document[:mysql_row])
  /home/deploy/twingly-staging-zambezi/releases/20140305193534/lib/binlog/message.rb:12:in `call'
    block.call(document)
  /home/deploy/twingly-staging-zambezi/releases/20140305193534/lib/binlog/message.rb:12:in `block in handle_payload'
    block.call(document)
  /home/deploy/twingly-staging-zambezi/releases/20140305193534/lib/binlog/message.rb:10:in `each'
    messages.each do |message|
  /home/deploy/twingly-staging-zambezi/releases/20140305193534/lib/binlog/message.rb:10:in `handle_payload'
    messages.each do |message|
  /home/deploy/twingly-staging-zambezi/releases/20140305193534/lib/binlog/queue.rb:93:in `block in subscribe'
    success = Message.handle_payload(payload, &block)
  bunny/consumer.rb:54:in `call'
    @on_delivery.call(*args) if @on_delivery
  bunny/consumer.rb:54:in `call'
    @on_delivery.call(*args) if @on_delivery
  bunny/channel.rb:1642:in `block in handle_frameset'
    consumer.call(DeliveryInfo.new(basic_deliver, consumer, self), MessageProperties.new(properties), content)
  bunny/consumer_work_pool.rb:84:in `call'
    callable.call
  bunny/consumer_work_pool.rb:84:in `block (2 levels) in run_loop'
    callable.call
  bunny/consumer_work_pool.rb:80:in `loop'
    loop do
  bunny/consumer_work_pool.rb:80:in `block in run_loop'
    loop do
  bunny/consumer_work_pool.rb:79:in `catch'
    catch(:terminate) do
  bunny/consumer_work_pool.rb:79:in `run_loop'
    catch(:terminate) do

I know that we're not using Addressable anymore (https://github.com/twingly/zambezi/pull/84), but I want to have a discussion about how we should handle (malformed) URLs.