Unable to scan early PSX games

Hi

When scanning a folder on PSX games (redump cue+bin) several games failed being scanned properly, mostly the very early PSX Games that didn't have the serial in the game data itself.
Example with Ridge Racer (Japan)

So Retroarch properly finds the 'Magic Numbers' in the data track, and knows it's dealing with a PS1 game. But since the serial can't be found, it decides to report it found a fake serial 'XXXXXXXXXX' (in \tasks\task_database_cue.c(280))
I've modified this function to actually return false at the end, and RetroArch then naturally used the crc fallback and my games were properly identified.

What is the reason for returning this fake 'XXXXXXXXXX' serial ?
Can't we just change the function to return a real failure so retroarch know the serial could not be extracted ?

Expected behavior

We can scan Ridge Racer (Japan) with the folder scanner (other games also have this issue)

Actual behavior

RetroArch detects the game is ps1, but can't extract the serial, so it's returning a fake 'XXXXXXXXXX' serial, which can't be looked up in the database.

Steps to reproduce the bug

1. Get a clean Redump rip of Ridge Racer (Japan) and place it in a folder.
2. In retroarch, use the Scanner to analyze this folder

Environment information

• OS: Win11
• Compiler: patched and Recompiled with VS2019 and game was scanned properly

Start in tasks/task_database_cue.c around line 280 and reproduce the folder scan with a clean Redump Ridge Racer (Japan) cue+bin set. Check how the fake XXXXXXXXXX serial affects database lookup and compare the reported CRC fallback behavior. Done means the scanner identifies Ridge Racer and other early PSX games without embedded serials.