web: explicitly handle attempt to remove player with matches
web: explicitly handle attempt to remove player with matches

It is impossible to remove the player that had matches,
but we thus far we handled that by allowing the database
failure and returning a rather cryptic error message.

Fix it by explicltly checking for the specific error
case and report the error explicitly.

Signed-off-by: Ilija Hadzic <47a09d4a4430975766160361f65fc72633be50b6@gmail.com>

ihadzic/jim,ihadzic/jim,ihadzic/jim