By City AM reporter It has been a bad year to be a Currys investor and shareholders will be hoping for chief executive Alex Baldock to pull something out of the hat on Thursday that they can cheer for. The electronics retailer will update the markets on how it performed in the first half of a year where revenue is expected to fall by nearly half a billion pounds. The first-half results are traditionally far less important for the company as they cut out in October, before people start shopping for Christmas presents. But shareholders might be happy to learn of progress on the sale of Currys’ G…