Remove blank line

Author: Vinod K C

python/pyspark/rdd.py

@@ -2237,7 +2237,6 @@ def countApproxDistinct(self, relativeSD=0.05):
         >>> 16 < n < 24
         True
         """
-
         # the hash space in Java is 2^32
         hashRDD = self.map(lambda x: portable_hash(x) & 0xFFFFFFFF)
         return hashRDD._to_java_object_rdd().countApproxDistinct(relativeSD)