[FlashPy]: fix concatenate for a single-element array.
[FlashPy]: fix concatenate for a single-element array.

flashxio/FlashX,flashxio/FlashX,icoming/FlashX,icoming/FlashX,flashxio/FlashX,flashxio/FlashX,flashxio/FlashX,icoming/FlashX,icoming/FlashX,icoming/FlashX,flashxio/FlashX