[BUGFIX] #24: exception when user name and/or password is incorrect in Frontend

[dmitryd]

Fixes the issue by checking that variable is set to a proper object.

[liayn]

Since version 8 the TimeTracker is a singleton, so we should adjust this to use makeInstance if the global TT is not set

[dmitryd]

Why should we create TT if it does not exist? If it does not exist, it means nobody is logging anything. Not worth creating it than.

[liayn]

The TT is not set at all anymore since v8. Checking the global only means that this logging will only happen in v7.
Therefore I would create the TimeTracker.

But I have no hard feelings about this, we can also simply remove the TT stuff completely.

[dmitryd]

I would prefer to remove it. I am not sure if I added it and if I did, why. May be, it was when the ext was originally programmed for 4.x, and TYPO3 did not have any other logging ways.

It could make sense to use a regular logger these days but than EXT:openid will show false warnings in logs every time when password was entered incorrectly. So the best would be to remove it. I will update the PR.

[dmitryd]

To the maintainer: please, squash when merging. Thanks!