Presenter: fixed uninitialized $since [Closes #166]

Author: dg

src/Application/UI/Presenter.php

@@ -1087,13 +1087,16 @@ protected function getGlobalState($forClass = NULL): array
 			}
 
 			$components = $this->getReflection()->getPersistentComponents();
-			$iterator = $this->getComponents(TRUE, IStatePersistent::class);
+			$iterator = $this->getComponents(TRUE);
 
 			foreach ($iterator as $name => $component) {
 				if ($iterator->getDepth() === 0) {
 					// counts with Nette\Application\RecursiveIteratorIterator::SELF_FIRST
 					$since = $components[$name]['since'] ?? FALSE; // FALSE = nonpersistent
 				}
+				if (!$component instanceof IStatePersistent) {
+					continue;
+				}
 				$prefix = $component->getUniqueId() . self::NAME_SEPARATOR;
 				$params = [];
 				$component->saveState($params);