DCOM-216: [GH-298] Silence E_NOTICE warning: "Undefined index".

[doctrinebot]

Jira issue originally created by user @doctrinebot:

This issue is created automatically through a Github pull request on behalf of fredrik-w:

Url: #298

Message:

Running PHP with error reporting on for E_NOTICE this bit me. Fix is simple and straightforward, check if key is defined and use that value if so, otherwise use null.

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-298] was closed:
#298

[doctrinebot]

Comment created by @Ocramius:

Merged: d9dea98

[doctrinebot]

Issue was closed with resolution "Fixed"