Merge branch '6.4' into 7.1

* 6.4:
  [Process] minor fix
  [Process] Fix finding executables independently of open_basedir
  [HttpKernel] Skip logging uncaught exceptions in ErrorHandler, assume $kernel->terminateWithException() will do it
  parse empty sequence elements as null

Author: nicolas-grekas

EventListener/DebugHandlersListener.php

@@ -67,6 +67,7 @@ public function configure(?object $event = null): void
             return;
         }
         $this->firstCall = $this->hasTerminatedWithException = false;
+        $hasRun = null;
 
         if (!$this->exceptionHandler) {
             if ($event instanceof KernelEvent) {
@@ -103,6 +104,19 @@ public function configure(?object $event = null): void
 
             if ($handler instanceof ErrorHandler) {
                 $handler->setExceptionHandler($this->exceptionHandler);
+                if (null !== $hasRun) {
+                    $throwAt = $handler->throwAt(0) | \E_ERROR | \E_CORE_ERROR | \E_COMPILE_ERROR | \E_USER_ERROR | \E_RECOVERABLE_ERROR | \E_PARSE;
+                    $loggers = [];
+
+                    foreach ($handler->setLoggers([]) as $type => $log) {
+                        if ($type & $throwAt) {
+                            $loggers[$type] = [null, $log[1]];
+                        }
+                    }
+
+                    // Assume $kernel->terminateWithException() will log uncaught exceptions appropriately
+                    $handler->setLoggers($loggers);
+                }
             }
             $this->exceptionHandler = null;
         }