class_exists(classname) should be class_exists(classname, false) in a few places

[jcjcc]

Five files contain calls to class_exists without the second parameter set to false. When an autoloader is registered but the class doesn't exist, a fatal exception is thrown (see #13436) unless this second parameter is set.

The incorrect calls to "class_exists" (ie. with only one argument) are in wp-includes/pomo/{entry, translations, streams, mo}.php.

One more instance in wp-includes/pluggable-deprecated.php.

The changes are very simple and should look like this (here is the one instance in pluggable-deprecated.php):

if ( ! class_exists( 'wp_atom_server' ) ) {

becomes

if ( ! class_exists( 'wp_atom_server', false ) ) {

#13436 mentions several more instances, but I did the above changes by hand and the site loads fine now. (It would be probably to go through and look at every instance of class_exists, though.)

[SergeyBiryukov]

Duplicate of #13436.