fix/#331: TIDO able to diplay single manifest

Bug fix

Apart from what is mentioned in the main ticket you are going to close with this MR, tell us what you have done to achieve this goal.

To test:

On the develop, using the entrypoint of single manifest https://ahikar-dev.sub.uni-goettingen.de/api/textapi/ahikar/syriac/3r678/manifest.json run the app, nothing gets displayed.
Please pull the branch issue/#331-single-manifest to test in local and run the app, it should run without any errors and displaying the single manifest. Added the same condition check from where we use to get complete collection and display.

Edited Aug 27, 2021 by dindigala