DBAL-1260: [GH-878] Fix call on non-object in ping() with PDO wrapper

[doctrinebot]

Jira issue originally created by user @doctrinebot:

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

Url: #878

Message:

Fixes an issue when calling ping() where $this->platform is null. Happened to me because using the 'pdo' param bypasses the connect() method and the platform is never set without explicitly calling the method.

Not sure if this is the most elegant way to deal with this but it worked enough for my purposes so I figured I should submit a PR.

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-878] was merged:
#878

[doctrinebot]

Issue was closed with resolution "Fixed"

[github-actions]

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