DDC-2039: [GH-452] fix persistance for many-to-one association when using not primary key for referenced column

[doctrinebot]

Jira issue originally created by user @beberlei:

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

Url: #452

Message:

Bugfix for exception:
Undefined index: xyz in ...\doctrine\orm\lib\Doctrine\ORM\Persisters\BasicEntityPersister.php line 608
Problem occur, if you are using not the primary key for a many-to-one��association.
For example if you using: @joincolumn(name="address_no", referencedColumnName="a_no")
$newValId has only the primary key as element, but��
$newValId[$targetColumn] becomes in this case��
$newValId['a_no'] and this element does not exist -> exception

[doctrinebot]

Comment created by @beberlei:

A related Github Pull-Request [GH-452] was closed
#452

[doctrinebot]

Issue was closed with resolution "Invalid"

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-452] was closed:
doctrine/dbal#452