export a pair only if it contains tracks
export a pair only if it contains tracks

yoshidaken/openMVG,caymard/openMVG,openMVG/openMVG,mojovski/openMVG,yoshidaken/openMVG,danylaksono/openMVG,Vinzza/openMVG,Smozeley/openMVG,mojovski/openMVG,caymard/openMVG,caymard/openMVG,danylaksono/openMVG,openMVG/openMVG,Vinzza/openMVG,openMVG/openMVG,Smozeley/openMVG,poparteu/openMVG,Smozeley/openMVG,poparteu/openMVG,Vinzza/openMVG,mojovski/openMVG,poparteu/openMVG,danylaksono/openMVG,poparteu/openMVG,yoshidaken/openMVG,openMVG/openMVG,openMVG/openMVG