Scottish Rugby have declared Murrayfield open for business to host the Scottish Cup semi-final between Hearts and Hibs.SRU chief exec Dominic McKay has paved the way for the all Edinburgh clash to be played at the home of rugby after Scottish FA president Rod Petrie proposed a possible switch from Hampden and insisting this season’s competition will be completed.But Petrie also questioned the wisdom of allowing up to 50,000 supporters from Edinburgh to travel through to Glasgow for the tie and a solution would be found by playing the last four clash in the capital.He said: “We need to be open-minded enough to look at all considerations.”Celtic have been paired with Aberdeen for the other tie which was scheduled for the national stadium last