Fixes #598 without breaking #171

[daraii]

The issue #171 fixed an problem when converting a DetachedCriteria (using where queries) but it broke DetachedCriterias (not using where queries) when the alias is specified by using createAlias as shown in the demo included in #598.

Example:

Publisher.createCriteria().list {
            'in'("pubIdentifier", new DetachedCriteria<Isbn>(Isbn).build {
                createAlias("book", "b")
                projections {
                    property("publisher")
                }
                'eq'("b.author", a)
            })
}

For domains:

class Author {
    static hasMany = [books: Book]
    String name
}

class Book {
    String title
    static belongsTo = [author: Author]
    static hasMany = [isbn: Isbn]
}

class Isbn {
    String pubGroup
    String publisher
    String title
    String checkDigit
    static belongsTo = [book: Book]
}

class Publisher {
    String name
    String pubIdentifier
}

The proposed commit allows to use the createAlias inside the DetachedCriteria as it worked before the changes for #171 without breaking those changes.

[puneetbehl]

@daraii Could you please add some tests specific to this change?

[daraii]

@puneetbehl Added tests (daraii@1753131)