Parsing fails with unicode chars followed by a URL

[agis]

The following example demonstrates (ignore the messages from slackbot):

While Cog executed the first command, it didn't execute the second.

Happens on 0.16.1 and in the Cog running in http://cogbot.slack.com.

[kevsmith]

Preliminary debugging confirms Cog's parser isn't mangling multi-byte Unicode characters. The failure must be happening further along pipeline processing.

I'm using this page for Greek character input.

[vanstee]

Confirmed on master that echo "ϻ https://google.com" crashes with the following error:

2016-12-06T15:33:53.583 module=Cog.Chat.Slack.Connector line=3 [error] no case clause matching: nil
2016-12-06T15:33:53.585 module=Cog.Chat.Slack.Connector line=3 [error]     (cog) lib/cog/chat/slack/formatter.ex:51: anonymous fn/1 in Cog.Chat.Slack.Formatter.unescape_links/1
    (cog) lib/cog/chat/slack/formatter.ex:66: Cog.Chat.Slack.Formatter.replace/3
    (cog) lib/cog/chat/slack/connector.ex:282: Cog.Chat.Slack.Connector.annotate_message/2
    (cog) lib/cog/chat/slack/connector.ex:39: Cog.Chat.Slack.Connector.handle_message/2
    (cog) lib/cog/chat/slack/connector.ex:3: Cog.Chat.Slack.Connector.websocket_handle/3
    src/websocket_client.erl:384: :websocket_client.retrieve_frame/6
    (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3

[agis]

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