By Jorge Otaola BUENOS AIRES (Reuters) -Argentine President Alberto Fernandez held meetings and telephone calls on Sunday as he scrambled to find a new economy minister, official sources said, after the abrupt exit of ally Martin Guzman shook the country’s center-left government. By Sunday afternoon there was still no sign of a successor. “No news,” a government spokesperson told Reuters. Guzman, 39, submitted his resignation late on Saturday amid rising tensions within the ruling Peronist coalition over how to handle economic crises that have been exacerbated by Russia’s invasion of Ukraine a…