[Fix] Hand null to the Frontend if we can't fetch a game's info (#3818

)

src/backend/main.ts

@@ -708,7 +708,14 @@ ipcMain.handle('getGameInfo', async (event, appName, runner) => {
   if (runner === 'legendary' && !LegendaryLibraryManager.hasGame(appName)) {
     return null
   }
-  return gameManagerMap[runner].getGameInfo(appName)
+  const tempGameInfo = gameManagerMap[runner].getGameInfo(appName)
+  // The game managers return an empty object if they couldn't fetch the game
+  // info, since most of the backend assumes getting it can never fail (and
+  // an empty object is a little easier to work with than `null`)
+  // The frontend can however handle being passed an explicit `null` value, so
+  // we return that here instead if the game info is empty
+  if (!Object.keys(tempGameInfo).length) return null
+  return tempGameInfo
 })
 
 ipcMain.handle('getExtraInfo', async (event, appName, runner) => {