`TypeError` when no integrations are specified in `base.yml`

[nisarg73]

Describe the bug
Backend throws a TypeError if integrations is left blank in base.yml.

This is because in

omniport-backend/omniport/omniport/settings/configuration/integrations.py

Line 12 in d1261f6

if 'sentry' in _CONF.integrations:

_CONF.integrations is None and hence not iterable here.

To Reproduce
Make integrations blank in base.yml

Expected behavior
There should be a check first, to see if integrations is None or not, to avoid this TypeError

Operating System:

• OS: Linux
• Browser: Firefox

Want to take up?
Sure

[nisarg73]

Note that this check should be made in all the apps and services, where integrations is used. For example, in Facapp (https://github.com/IMGIITRoorkee/omniport-app-faculty-profile/blob/508c205ecc2de8dc1e9fad052e9d34d334f41ae5/views.py#L279) would throw an AttributeError here if integrations is None

[pradumangoyal]

In the base_stencil.yml, integration was marked as a required field with an empty dictionary by default. People mostly clone the configuration files from the documentation as it is and the files there are bit outdated. That is meant to be updated with the above-suggested change, and consecutively TypeError will be removed.