[TASK] Refactoring some code, exception handling

Classes/Controller/MailController.php

@@ -107,10 +107,10 @@ class MailController extends ActionController {
 		// get last selected languages
 		if ($selectedLanguageLeft === NULL) {
 			$selectedLanguageLeftFromSession = $this->session->getDataByKey('selectedLanguageLeft');
-			if ($selectedLanguageLeftFromSession=== NULL) {
-				$selectedLanguageLeft = $languages[0];
-			} else {
+			if ($selectedLanguageLeftFromSession !== NULL) {
 				$selectedLanguageLeft = $selectedLanguageLeftFromSession;
+			} else {
+				$selectedLanguageLeft = $languages[0];
 			}
 		}