[BUGFIX] Check if the name of the edited type is unique

Classes/SGalinski/TypoScriptReferenceFrontend/Controller/TsrefController.php

@@ -102,6 +102,19 @@ class TsrefController extends \TYPO3\Flow\Mvc\Controller\ActionController {
 			if ($theType->getParent() === -1) {
 				$theType->setParent(NULL);
 			}
+			// Check if the type is unique
+			$theTypeIsUnique = FALSE;
+			try {
+				$this->tsrefRestService->getTypeByUrlName($theType->getUrlName());
+			} catch (\Exception $notExist) {
+				if ($notExist->getCode() === 404) {
+					$theTypeIsUnique = TRUE;
+				}
+			}
+			if (!$theTypeIsUnique) {
+				throw new \RuntimeException('The name of the type must be unique.');
+			}
+
 			if ($editForm) {
 				$result = $this->tsrefRestService->editAttribute($theType);
 			} else {