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file_stream_wrapper_valid_scheme now works with FALSE

Project: 
Drupal core
Introduced in branch: 
8.x
Description: 

Previously

<?php
if ($scheme && file_stream_wrapper_valid_scheme($scheme))
?>

Now
<?php
if (file_stream_wrapper_valid_scheme($scheme))
?>

Similiarly

<?php
if (!$scheme || !file_stream_wrapper_valid_scheme($scheme))
?>

Now
<?php
if (!file_stream_wrapper_valid_scheme($scheme))
?>
Impacts: 
Module developers
Updates Done (doc team, etc.)
Online documentation: 
Not done
Theming guide: 
Not done
Module developer documentation: 
Not done
Examples project: 
Not done
Coder Review: 
Not done
Coder Upgrade: 
Not done
Other: 
Other updates done