fix #2543

Closes #2543

Merge request studip/studip!1727

lib/models/Courseware/BlockTypes/Folder.json

@@ -15,5 +15,5 @@
     "required": [
         "folder_id"
     ],
-    "additionalProperties": false
+    "additionalProperties": true
 }

lib/models/Courseware/BlockTypes/Gallery.json

@@ -27,5 +27,5 @@
     "required": [
         "folder_id"
     ],
-    "additionalProperties": false
+    "additionalProperties": true
 }

resources/vue/store/courseware/courseware-shelf.module.js

@@ -405,7 +405,7 @@ export const actions = {
     },
 
     async createFile(context, { file, filedata, folder }) {
-        const termId = file?.relationships['terms-of-use']?.data?.id ?? null;
+        const termId = file?.relationships?.['terms-of-use']?.data?.id ?? null;
         const formData = new FormData();
         formData.append('file', filedata, file.attributes.name);
         if (termId) {