fix: Catch unexpected results with no type

Signed-off-by: Julius Knorr <jus@bitgrid.net>

Author: juliusknorr

lib/Service/TemplateFieldService.php

@@ -93,7 +93,7 @@ public function extractFields(Node|int $file): array {
 			$fields = [];
 
 			foreach ($documentStructure as $index => $attr) {
-				$fieldType = FieldType::tryFrom($attr['type']) ?? null;
+				$fieldType = FieldType::tryFrom($attr['type'] ?? '') ?? null;
 				if ($fieldType === null) {
 					continue;
 				}