System.Collections.Generic.KeyNotFoundException: The given key 'upper_body' was not present in the dictionary.

Sentry Issue: [UNITY-EXPLORER-PF3](https://decentraland.sentry.io/issues/7595334705/)

```
System.Collections.Generic.KeyNotFoundException: The given key 'upper_body' was not present in the dictionary.
File "il2cpp-codegen.h", line 34, in IsEquipped
File "DCL.Social__24.cpp", line 18526, in SetGridElements
File "DCL.Social__24.cpp", line 422, in AwaitWearablesPromiseAsync
File "DCL.AvatarRendering.cpp", line 19333, in GetTrimmedByParamsAsync
File "DCL.AvatarRendering.cpp", line 20535, in GetTrimmedByParamsAsync
...
(32 additional frame(s) were not displayed)
```
This issue was automatically created by Sentry via [Explorer Alpha Github Issue Creation](https://sentry.io/organizations/decentraland/monitors/alerts/3130340/)

Start with the Sentry issue and its stack trace, then locate the project source corresponding to IsEquipped, SetGridElements, AwaitWearablesPromiseAsync, and GetTrimmedByParamsAsync; the trace names generated files including DCL.Social__24.cpp and DCL.AvatarRendering.cpp. Investigate why the 'upper_body' key is absent from the dictionary, and verify that the reported exception no longer occurs.

Written by the indexing model from the issue text.