Description:
------------
The ReflectionClass::implementsInterface() correctly returns boolean true for a given interface the subject class implements, but instead of returning boolean false for one it does not, a ReflectionException is thrown instead.

Reproduce code:
---------------
<?php

interface Polite
{
    public static function sayHello();
}

class Greeting implements Polite
{
    public static function sayHello()
    {
        echo "Hello<br>\n";
    }
}

Greeting::sayHello();
$refl = new ReflectionClass('Greeting');

if ($refl->implementsInterface('Polite')) {
    echo "Greeting implements Polite<br>\n";
} else {
    echo "Greeting does not implements Polite<br>\n";
}


if ($refl->implementsInterface('Rude')) {
    echo "Greeting implements Rude<br>\n";
} else {
    echo "Greeting does not implement Rude<br>\n";
}
?>

Expected result:
----------------
Hello
Greeting implements Polite
Greeting does not implement Rude

Actual result:
--------------
Hello
Greeting implements Polite

Fatal error: Uncaught exception 'ReflectionException' with message 'Interface Rude does not exist' in /home/mim/sites/intranet.home/tech/PHP/static-classes/static-object-usage.php:26 Stack trace: #0 /home/mim/sites/intranet.home/tech/PHP/static-classes/static-object-usage.php(26): ReflectionClass->implementsInterface('Rude') #1 {main} thrown in /home/mim/sites/intranet.home/tech/PHP/static-classes/static-object-usage.php on line 26