Ensure creatorsToString() always returns a string

The current implementation will return undefined if the creators
array is empty. This causes other functions which expect a string
(which is what TypeScript assumes) to fail.

Add a return type to the function to assert the intention of the
function. We could also have allowed it to return undefined if the
creators array is empty but that seems to be against the naming of the
function, creatorsToString.

Add a check to handle single array and empty creators array
separately. If there are no creators then return an empty string.

src/core/utils/helpers/general.ts

@@ -1,6 +1,6 @@
 import { useEffect, useRef } from "react";
 import dayjs from "dayjs";
-import { uniq } from "lodash";
+import { first, uniq } from "lodash";
 import { vi } from "vitest";
 import { CoverProps } from "../../../components/cover/cover";
 import { UseTextFunction } from "../text";
@@ -67,13 +67,18 @@ const getCreatorsFromManifestations = (manifestations: Manifestation[]) => {
   return Array.from(new Set(creators)) as string[];
 };
 
-export const creatorsToString = (creators: string[], t: UseTextFunction) => {
+export const creatorsToString = (
+  creators: string[],
+  t: UseTextFunction
+): string => {
   if (creators.length > 1) {
     const firstTwo = creators.slice(0, 2);
     return `${firstTwo.join(", ")} ${t("etAlText")}`;
   }
-
-  return creators[0];
+  if (creators.length === 1) {
+    return first(creators) as string;
+  }
+  return "";
 };
 
 export const getCreatorTextFromManifestations = (