DBAL-1129: [GH-783] Fixes issue (DBAL-1057) use default platform when not connected

[doctrinebot]

Jira issue originally created by user @doctrinebot:

This issue is created automatically through a Github pull request on behalf of weaverryan:

Url: #783

Message:

Hi guys!

This is a fix for http://www.doctrine-project.org/jira/browse/[DBAL-1057](http://www.doctrine-project.org/jira/browse/DBAL-1057). It leaves the ability to set the platform and platform version from sha: 3176f51, but does not try to connect if we're not already connected. This is consistent with the previous behavior (again see the linked sha) - before there was never a connection made to determine the platform.

The alternate solution is to connect, but surround this by a try-catch (PDOException, DriverException, Exception?) and return null. in case we have some situation where the database isn't created or the connection information is wrong.

I know this issue is causing a lot of problems around my world (I ran into myself yesterday), so thanks in advance for the attention.

Thanks!

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-783] was closed:
#783

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-783] was reopened:
#783

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-783] was closed:
#783

[github-actions]

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