BUG: OHIF viewer given StudyInstanceID not in index will 'spin' indefinitely.

[dmoore247]

Example:
Working example: https://pixels-ohif-viewer-nnnnnnnnnnnnnnnn.aws.databricksapps.com/ohif/viewer?StudyInstanceUIDs=1.2.276.0.7230010.3.1.4.1787169844.30665.1454576944.480537

Non-working example: https://pixels-ohif-viewer-nnnnnnnnnnnnnnnn.aws.databricksapps.com/ohif/viewer?StudyInstanceUIDs=1.2.276.0.7230010.3.1.4.1787169844.30665.1454576944.480537ZZZZZZZZ

Leaves user in the "loading" screen.

Prefer that we display message to user "StudyInstanceID.... not found in current index."