added file-not-exist test for partitions
added file-not-exist test for partitions

Winterflower/khmer,jas14/khmer,ged-lab/khmer,souravsingh/khmer,F1000Research/khmer,Winterflower/khmer,ged-lab/khmer,F1000Research/khmer,F1000Research/khmer,souravsingh/khmer,kdmurray91/khmer,ged-lab/khmer,souravsingh/khmer,jas14/khmer,kdmurray91/khmer,kdmurray91/khmer,jas14/khmer,Winterflower/khmer