Wrap legacy code with method_exists() call to allow a grace period to remove.

Author: discordier

system/modules/multicolumnwizard/MultiColumnWizard.php

@@ -911,22 +911,25 @@ public function handleDcGeneral($arrData, $strName)
             /* @var \ContaoCommunityAlliance\DcGeneral\EnvironmentInterface $environment */
             $environment = $this->objDca->getEnvironment();
             // FIXME: begin of legacy code to be removed.
-            $event   = new \ContaoCommunityAlliance\DcGeneral\Contao\View\Contao2BackendView\Event\GetPropertyOptionsEvent($environment, $this->objDca->getModel());
-            $event->setPropertyName($strName);
-            $event->setOptions($arrData['options']);
-            $environment->getEventPropagator()->propagate(
-                $event::NAME,
-                $event,
-                array(
-                    $environment->getDataDefinition()->getName(),
-                    $this->strName,
-                    $strName
-                )
-            );
-
-            if ($event->getOptions() !== $arrData['options'])
+            if (method_exists($environment, 'getEventPropagator'))
             {
-                $arrData['options'] = $event->getOptions();
+                $event   = new \ContaoCommunityAlliance\DcGeneral\Contao\View\Contao2BackendView\Event\GetPropertyOptionsEvent($environment, $this->objDca->getModel());
+                $event->setPropertyName($strName);
+                $event->setOptions($arrData['options']);
+                $environment->getEventPropagator()->propagate(
+                    $event::NAME,
+                    $event,
+                    array(
+                        $environment->getDataDefinition()->getName(),
+                        $this->strName,
+                        $strName
+                    )
+                );
+
+                if ($event->getOptions() !== $arrData['options'])
+                {
+                    $arrData['options'] = $event->getOptions();
+                }
             }
             // FIXME: end of legacy code to be removed.