Update DApps query filtering

[brunomenezes]

Summary

We change the backend to handle the case of inputs targeting DApps that were not yet "instantiated", more details here. So the changes are to improve the filtering to avoid listing non-existing DApps. Also did a small clean-up of unused properties in the query.

[vercel[bot]]

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Name	Status	Preview	Updated (UTC)
rollups	✅ Ready (Inspect)	Visit Preview	Jun 15, 2023 0:42am
staking	✅ Ready (Inspect)	Visit Preview	Jun 15, 2023 0:42am

[coveralls]

Pull Request Test Coverage Report for Build 5273508581

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.005%) to 71.011%

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Totals
Change from base Build 5262487654:	0.005%
Covered Lines:	2536
Relevant Lines:	3404

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💛 - Coveralls