If password is "" in dsn, I get a error options after parseOpts

[YoungWing]

test code like this:

        o := make(map[string]string)
    dsn := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=disable",
        "localhost",
        5432,
        "test",
        "",
        "testDB",
    )
    parseOpts(dsn, o)
    fmt.Println(o)

output:

map[host:localhost password:dbname=testDB port:5432 sslmode:disable user:test]

in this map, we can see the passwd value is that "dbname=testDB" rather than ""

In this case，it is a wrong dsn parser？

Or when my passwd is null, I can only put passwd end of dsn，like this：

dsn := fmt.Sprintf("host=%s port=%d user=%s dbname=%s sslmode=disable password=%s",
        "localhost",
        5432,
        "test",
        "testDB",
        "",
    ) 

[cbandy]

Blank values need to be wrapped in single quotes. The package docs could be more explicit about this.

• https://godoc.org/github.com/lib/pq#hdr-Connection_String_Parameters
• https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-CONNSTRING

  To write an empty value, or a value containing spaces, surround it with single quotes