fix: errors during word generation when custom text was empty

also migrate if an empty array was found in localstorage

Author: Miodec

frontend/src/ts/modals/custom-text.ts

@@ -357,6 +357,11 @@ function apply(): void {
 
   const text = cleanUpText();
 
+  if (text.length === 0) {
+    Notifications.add("Text cannot be empty", 0);
+    return;
+  }
+
   if (state.customTextMode === "simple") {
     CustomText.setMode("repeat");
     state.customTextLimits.word = `${text.length}`;

frontend/src/ts/test/custom-text.ts

@@ -31,7 +31,7 @@ const customTextLongLS = new LocalStorageWithSchema({
 });
 
 export const CustomTextSettingsSchema = z.object({
-  text: z.array(z.string()),
+  text: z.array(z.string()).min(1),
   mode: CustomTextModeSchema,
   limit: z.object({ value: z.number(), mode: CustomTextLimitModeSchema }),
   pipeDelimiter: z.boolean(),