fix(ui): fix metadata when we do not have uploadData

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2307>

front/src/components/channels/UploadForm.vue

@@ -178,7 +178,7 @@ const uploadedFiles = computed(() => {
 
     if (file.response?.uuid) {
       const uuid = file.response.uuid as string
-      data.metadata = uploadImportData[uuid] ?? uploadData[uuid].import_metadata ?? {}
+      data.metadata = uploadImportData[uuid] ?? uploadData[uuid]?.import_metadata ?? {}
       data.removed = removed.has(uuid)
     }