By Catarina Demony and Miguel Pereira LISBON (Reuters) -Portuguese voters went to the polls on Sunday in a parliamentary election with no clear winner in sight and uncertainty increased by potentially low turnout because of record coronavirus infections. Polling stations opened at 8:00 am (0800 GMT). At the University of Lisbon, staff outnumbered mostly elderly voters, with signs on the walls asking people to wear a mask, observe social distancing and to use their own pen. Some even wore gloves for extra protection. “I have been vaccinated, and I haven’t had COVID yet… But I felt very safe,”…