goqu:"omitempty" not omit empty field.

[BhautikChudasama]

Describe the bug
I want to omit the zerovalue string. I am using example mentioned code.

To Reproduce

type item struct {
	FirstName string  `db:"first_name" goqu:"omitempty"`
	LastName  string  `db:"last_name" goqu:"omitempty"`
	Address1  *string `db:"address1" goqu:"omitempty"`
	Address2  *string `db:"address2" goqu:"omitempty"`
	Address3  *string `db:"address3" goqu:"omitempty"`
}
address1 := "114 Test Addr"
var emptyString string
sql, args, _ := goqu.Update("items").Set(
	item{
		FirstName: "Test First Name",
		LastName:  "", // will omit zero field
		Address1:  &address1,
		Address2:  &emptyString,
		Address3:  nil, // will omit nil pointer
	},
).ToSQL()
fmt.Println(sql, args)

Actual Output

UPDATE "items" SET "address1"='114 Test Addr',"address2"='',"address3"=NULL,"first_name"='Test First Name',"last_name"='' []

Expected behavior
The last name should not add.

UPDATE "items" SET "address1"='114 Test Addr',"address2"='',"first_name"='Test First Name' []

Dialect:

• postgres
• mysql
• sqlite3

Additional context
Add any other context about the problem here.

[yura1338]

Got same bug in v9.18.0. v9.19.0 is OK

[TatarinAlba]

Got same bug in v9.18.0. v9.19.0 is OK

Can confirm that also worked for me on v9.19.0