[#534] Return error if bucket has no tag set

Signed-off-by: Marina Biryukova <m.biryukova@yadro.com>

api/errors/errors.go

@@ -193,6 +193,7 @@ const (
 	ErrInvalidRangeLength
 	ErrRangeOutOfBounds
 	ErrMissingContentRange
+	ErrNoSuchTagSet
 
 	ErrMalformedJSON
 	ErrInsecureClientRequest
@@ -1774,6 +1775,12 @@ var errorCodes = errorCodeMap{
 		Description:    "You have reached the quota limit.",
 		HTTPStatusCode: http.StatusConflict,
 	},
+	ErrNoSuchTagSet: {
+		ErrCode:        ErrNoSuchTagSet,
+		Code:           "NoSuchTagSet",
+		Description:    "The TagSet does not exist",
+		HTTPStatusCode: http.StatusNotFound,
+	},
 	// Add your error structure here.
 }