[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:  RMarks
     Type:  defect                   |      Status:  assigned
 Priority:  normal                   |   Milestone:
Component:  WordCamp Site & Plugins  |  Resolution:
 Keywords:  has-patch needs-testing  |
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Changes (by RMarks):

 * Attachment "3987.2.diff" added.

 Using is_readable() vs file_exists()

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