Using binding to select on null or value

[Mookie]

I am using QtSql module with a MySQL back end. I prefer to using bindValue() as much as is possible for input values in queries.

I have a case where I need to SELECT and look for a NULL in the WHERE clause.
A simplified example of what I need to do [effectively]:

SELECT * FROM rabbits WHERE color IS NULL;

All the binding examples in the documentation show only INSERT statements, however. The documentation says to bind the QVariant(QVariant::String) to the ":color" term.

void do_query(QString color)
{
  // stuff
  query.prepare("SELECT * FROM rabbits WHERE color=:color");
  if (color.isEmpty())
    query.bindValue(":color", QVariant(QVariant::String));
  else
    query.bindValue(":color", color);
  query.exec();
  // more stuff
}

void do_query(QString color)
{
  // stuff
  query.prepare("SELECT * FROM rabbits WHERE color=:color");
  if (color.isEmpty())
    query.bindValue(":color", QVariant(QVariant::String));
  else
    query.bindValue(":color", color);
  query.exec();
  // more stuff
}

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Some of the documentation wording gives me pause and I think it is probably specific to an INSERT statement which would convert to "=NULL" when making the MySQL call underneath. A where statement would need to be converted to " IS NULL" instead.

Is there is a way use binding to SELECT items matching a NULL as well as those matching a value?