added check

[ajstanley]

*Issue 1030: (link)

What does this Pull Request do?

If an Islandora installation does not use Fedora then viewing a media object will cause a fatal error

What's new?

A check for $fedora_root has been added to islandora_entity_view

How should this be tested?

Delete or comment out the flysystem config from settings.php, then try to view a media

Additional Notes:

Any additional information that you think would be helpful when reviewing this PR.

Interested parties

@Islandora/committers

[adam-vessey]

Shouldn't the display not be defining field_gemini_uri, if Fedora's not in use? https://github.com/Islandora/islandora/pull/1031/files#diff-9f1c9d46d88dce55fa1d0ce1103dd4184b824342407a63c2397844703c09b78eR548

[rosiel]

from Tech call:

• We'll clean up this section of code... thanks @ajstanley and @adam-vessey
• We'll also make a ticket for moving the "fedora stuff" to its own module