(Reuters) - Africa-focussed miner Petra Diamonds on Friday suspended its production forecast for fiscal 2020 and said it was in "active talks" with a South African lender for near-term financing, amid worries over the worsening coronavirus crisis.The miner, which has three operations in South Africa and one in Tanzania, withdrew its full year production outlook of 3.8 million carats that it had issued in July 2019.As South Africa is currently going through a three-week lockdown to contain the..