filter empty tables

test.csv

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:015947ab709e6271eb0ae6c42cf089328b1e89cc1daf950c91893ed17f0ddfb1
-size 16381515
+oid sha256:b9ae72d31cc4b436732ee2d955e1f0b42841dd13e5281e190f3395b6e3db5e83
+size 16772268

train.csv

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:fb197fa51e2efc109a4980510a4f81c427a18d4c5363f069ac519e510167110b
-size 132249819
+oid sha256:2e55672fc1506692b490b955254cd7cb697bbf70cf7f85754ecd7898ccd5277f
+size 131378435

valid.csv

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:c3674b36e2285d2a352aa03c0500fbf09e1b49a6db6d617fc76e15ab0985c541
-size 16428870
+oid sha256:09c86db29ef8ff9f57f0bfcb5e7f7976c1bd1b325a5ed303f98337b81ed09316
+size 16481234