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validate if cached value is empty before use (#13830)
fixes a crash reproduced while running hadoop tests
```
goroutine 201564 [running]:
github.com/minio/minio/cmd.metaCacheEntries.resolve({0xc0206ab7a0, 0x4, 0xc0015b1908}, 0xc0212a7040)
github.com/minio/minio/cmd/metacache-entries.go:352 +0x58a
```
Bonus: HeadBucket() should always provide content-type
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@@ -1210,7 +1210,7 @@ func (api objectAPIHandlers) HeadBucketHandler(w http.ResponseWriter, r *http.Re
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return
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}
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writeSuccessResponseHeadersOnly(w)
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writeResponse(w, http.StatusOK, nil, mimeXML)
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}
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// DeleteBucketHandler - Delete bucket
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