[TASK] Prepare for younger selenium-chrome (#226)

Some webdriver detail seems to throw a different
exception when an element is not found. Adapt
the page tree helper to deal with this.

Classes/Core/Acceptance/Helper/AbstractPageTree.php

@@ -93,6 +93,8 @@ protected function ensureTreeNodeIsOpen(string $nodeText, RemoteWebElement $cont
             // element not found so it may be already opened...
         } catch (\Facebook\WebDriver\Exception\ElementNotVisibleException $e) {
             // element not found so it may be already opened...
+        } catch (\Facebook\WebDriver\Exception\ElementNotInteractableException $e) {
+            // another possible exception if the chevron isn't there ... depends on facebook driver version
         }
 
         return $context;