China's yuan slips on concerns of wobbly stock market

HONG KONG, Aug 20- China's yuan fell against the dollar by midday on Thursday despite a stronger midpoint set by the central bank, as traders expect the currency to face further downward pressure amid a sluggish economy and wobbly stock market. The People's Bank of China set the midpoint rate at 6.3915 per dollar prior to market open, firmer than the previous fix...