fix: crash in ProtocolLogin (#4902)

[gesior]

Pull Request Prelude

• I have followed [proper The Forgotten Server code styling][code].
• I have read and understood the [contribution guidelines][cont] before making this PR.
• I am aware that this PR may be closed if the above-mentioned criteria are not fulfilled.

Changes Proposed

ProtocolLogin::getCharacterList reads IP from getConnection() in dispatcher event, but does not check, if connection still exists.
Without connection, whole login process can be skipped, as there is no way to return list of characters to Tibia Client.

Fixes crash reported in #4902

[gesior]

My PR fails on code style, because useless - there is no case in TFS code that could crash Game::addGuild code - PR #4908 was merged with 2 spaces indent (using spaces, not TABs) :(

#4924 fixes code style in Game::addGuild:
https://github.com/otland/forgottenserver/pull/4924/files#diff-0bb6c7b942a6c15255f935db679c066dfce4d4114fdb99698c1e1a09b7f5a98a

@ArturKnopik
Please check code style check before merging future PRs. One merged with errors makes all next PRs fail on code style.

[MillhioreBT]

My PR fails on code style, because useless - there is no case in TFS code that could crash Game::addGuild code - PR #4908 was merged with 2 spaces indent (using spaces, not TABs) :(

#4924 fixes code style in Game::addGuild: https://github.com/otland/forgottenserver/pull/4924/files#diff-0bb6c7b942a6c15255f935db679c066dfce4d4114fdb99698c1e1a09b7f5a98a

@ArturKnopik Please check code style check before merging future PRs. One merged with errors makes all next PRs fail on code style.

I think the builds are broken anyway, it doesn't matter if you fix the code format in that place.

[MillhioreBT]

Regarding this PR, it's very rare for someone to suffer from this issue, since the old protocol is supposedly no longer used. Now, the HTTP protocol is used to fetch the character list, but I still think this IF statement is fine there.