UpdateProps of community settings is rejected by Hivemind as invalid

[only-dev-time]

Updating the community props with custom_json op contains the field settings which is an empty object if no image has been set.

Example

Mention by user: https://steemit.com/@event-horizon/sp64bx
Transaction: https://steemworld.org/block/91602709/91602709-13

Hivemind

Hivemind doesn't accept empty objects in the fields:

INFO:hive.indexer.community:validating @hive-117153 op ['updateProps', {'community': 'hive-117153', 'props': {'title': 'ارتقاء', 'about': 'Invitation only community for progressive desi.', 'settings': {}, 'is_nsfw': False, 'lang': 'en', 'description': '', 'flag_text': ''}}]
WARNING:hive.indexer.notify:[NOTIFY] error - src None dst 1923595 pid None (key `settings` was blank) cid None (35/100)

link to the check: https://github.com/only-dev-time/hivemind/blob/33204e1c2a18551acdb60e0a6142d1e2a4983d71/hive/indexer/community.py#L89

Analysis

With #3927 in SettingsEditButton.jsx the field settings was added to the props for the custom_json:
only-dev-time@0da5aa3#diff-0b3b832a35933fe6e6ab1230a31131d076a671c39806fc56863578bcdcb39e83R100

@the-gorilla-steem Could a check that no images has been set solve the problem?

[the-gorilla-steem]

I've been working on a fix for this and in doing so, I broke Hivemind. So ety001 fixed Hivemind. Which appears to have fixed the issue with community images updating. Would you mind checking and confirming this for me please?

[only-dev-time]

@the-gorilla-steem I would check this, but where can I see your changes?

[the-gorilla-steem]

@only-dev-time - the Hivemind update has already been put live so it's available on steemit.com. It appears that I don't need to update condenser.

[only-dev-time]

@the-gorilla-steem I tested it with DU. The error still exists (I removed the old cover url before):
https://steemworld.org/block/92144888/92144888-2

INFO:hive.indexer.community:validating @moecki op ['updateProps', {'community': 'hive-146118', 'props': {'title': 'Deutsch Unplugged', 'settings': {}, 'is_nsfw': False, 'lang': 'de'}}]
WARNING:hive.indexer.notify:[NOTIFY] error - src None dst 737242 pid None (key `settings` was blank) cid None (35/100)

The fix for Hivemind concerns avatar_url, as there is a separate field for this in the community table. This must not be None. This has been fixed.

The still existing problem is that the field settings must not be empty if it is contained in the costum_json op. This still happens if cover_url and avatar_url are undefined.