Fixes type errors in the DocumentSearchForm

src/components/form/DocumentSearchForm.tsx

@@ -62,7 +62,6 @@ export const DocumentSearchInput = ({
       ?.includes(queryValue.toLowerCase()),
   );
 
-  // TODO: Better form formatting
   return (
     <BaseForm
       title={`Find ${DocumentTypeLabel[docType]}`}
@@ -70,7 +69,7 @@ export const DocumentSearchInput = ({
       error={null}
       onSubmit={() => selectedDoc && onSubmit(selectedDoc)}
       content={
-        <Combobox
+        <Combobox<AnyDocument | null>
           name={searchField}
           value={selectedDoc}
           onChange={(doc) => {
@@ -80,7 +79,7 @@ export const DocumentSearchInput = ({
         >
           <ComboboxInput
             displayValue={(doc: AnyDocument) =>
-              doc && getField(doc, searchField)
+              (doc && getField(doc, searchField)) ?? "(no value)"
             }
             onChange={(event) => setQueryValue(event.target.value)}
             className={`w-full p-2 rounded border bg-slate-800 text-slate-100 border-slate-700 focus:outline-none focus:ring-2 focus:ring-violet-500 transition-colors`}