[wp-meta] [Making WordPress.org] #3987: Only require Slack's include files if they exists

[Making WordPress.org]

#3987: Only require Slack's include files if they exists
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 Reporter:  RMarks                   |      Owner:  (none)
     Type:  defect                   |     Status:  assigned
 Priority:  normal                   |  Milestone:
Component:  WordCamp Site & Plugins  |   Keywords:
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 When on a local vvv environment, the following error is found:

 Warning: require_once(/srv/www/wordpress-meta-environment/meta-
 repository/wordcamp.org/public_html/wp-content/mu-
 plugins/includes/slack/send.php): failed to open stream: No such file or
 directory in /srv/www/wordpress-meta-environment/meta-
 repository/wordcamp.org/public_html/wp-content/mu-plugins/0-slack.php on
 line 9

 Plan is to only require if the file exists.

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Ticket URL: <https://meta.trac.wordpress.org/ticket/3987>
Making WordPress.org <https://meta.trac.wordpress.org/>
Making WordPress.org