Something like this:
LOAD CSV WITH HEADERS FROM 'file:///csv/organization.csv'' AS row
CREATE (n:Node)
SET n.property1 = CASE WHEN row.column1 IS NOT NULL AND row.column1 <> '' THEN row.column1 ELSE NULL END,
n.property2 = CASE WHEN row.column2 IS NOT NULL AND row.column2 <> '' THEN row.column2 ELSE NULL END