[wp-trac] [WordPress Trac] #29743: warning with join in nav-menu-template.php (L 98) when apply_filters nav_menu_css_class return null

[WordPress Trac]

#29743: warning with join in nav-menu-template.php (L 98) when apply_filters
nav_menu_css_class return null
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 Reporter:  eadoking     |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Menus        |    Version:  trunk
 Severity:  normal       |   Keywords:
  Focuses:               |
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 there is a warning because apply_filters on nav_menu_css_class return null
 and a warning happens in join clause , file "nav-menu-template.php" line
 98

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Ticket URL: <https://core.trac.wordpress.org/ticket/29743>
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