Parser followup (#2377)

* set pipe to empty string on empty closure

* fix missing parser flags and scope

* add closure serializing

* add enum provider function to slash command arguments

* add enum providers for /bg, /ask, and /go

* fix index out of bounds returning undefined

* keep whitespace as is in mixed unnamed args (string+closure)

* add _hasUnnamedArgument to named arguments dictionary

* allow /var key=x retrieval

* add enum provider to /tag-add

* fix typo (case)

* add option to make enum matching optional

* add executor to enum provider

* change /tag-add enum provider to only show tags not already assigned

* add enum provider to /tag-remove

* fix name enum provider excluding groups

* remove void from slash command callback return types

* Lint undefined and null pipes

* enable pointer events in chat autocomplete

* fix type hint

---------

Co-authored-by: LenAnderson <Anderson.Len@outlook.com>
Co-authored-by: Cohee <18619528+Cohee1207@users.noreply.github.com>

public/scripts/world-info.js

@@ -645,7 +645,7 @@ function registerWorldInfoSlashCommands() {
         await saveWorldInfo(file, data, true);
         reloadEditor(file);
 
-        return entry.uid;
+        return String(entry.uid);
     }
 
     async function setEntryFieldCallback(args, value) {
@@ -3541,6 +3541,7 @@ function onWorldInfoChange(args, text) {
 
     saveSettingsDebounced();
     eventSource.emit(event_types.WORLDINFO_SETTINGS_UPDATED);
+    return '';
 }
 
 export async function importWorldInfo(file) {