[SPARK-21583][HOTFIX] Removed intercept in test causing failures

Removing a check in the ColumnarBatchSuite that depended on a Java assertion.  This assertion is being compiled out in the Maven builds causing the test to fail.  This part of the test is not specifically from to the functionality that is being tested here.

Author: Bryan Cutler <cutlerb@gmail.com>

Closes #19098 from BryanCutler/hotfix-ColumnarBatchSuite-assertion.

sql/core/src/test/scala/org/apache/spark/sql/execution/vectorized/ColumnarBatchSuite.scala

@@ -1308,10 +1308,6 @@ class ColumnarBatchSuite extends SparkFunSuite {
       }
     }
 
-    intercept[java.lang.AssertionError] {
-      batch.getRow(100)
-    }
-
     batch.close()
     allocator.close()
   }