DataLoader with a DefaultCache throws key error when attempting to delete key that does not exist

[vjrasane]

Caused by:

    def delete(self, key: K) -> None:
        del self.cache_map[self.cache_key_fn(key)]

https://github.com/strawberry-graphql/strawberry/blame/8498682d0c192e5b940f93928fef0f230918c8c7/strawberry/dataloader.py#L83

In strawberry-graphql version 0.154.0

This can be worked around by providing a custom cache to the dataloader that checks existence before removal.

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