Fix Zero division error for percentage counts when cellcount was empty
Fix Zero division error for percentage counts when cellcount was empty

cellcounter/cellcounter,oghm2/hackdayoxford,cellcounter/cellcounter,haematologic/cellcounter,cellcounter/cellcounter,haematologic/cellcounter,haematologic/cellcounter,cellcounter/cellcounter,haematologic/cellcountr,haematologic/cellcountr,oghm2/hackdayoxford