Handle class_parents returning false in class_uses_recursive (#48902)

This will now take into account that `class_parents` can return false on error which would result in a boolean passed into `array_reverse`.

Author: RoflCopter24

src/Illuminate/Support/helpers.php

@@ -91,7 +91,7 @@ function class_uses_recursive($class)
 
         $results = [];
 
-        foreach (array_reverse(class_parents($class)) + [$class => $class] as $class) {
+        foreach (array_reverse(class_parents($class) ?: []) + [$class => $class] as $class) {
             $results += trait_uses_recursive($class);
         }