[SPARK-32779][SQL][FOLLOW-UP] Delete Unused code

### What changes were proposed in this pull request?
Follow-up PR as per the review comments in [29649](https://github.com/apache/spark/pull/29649/files/8d45542e915bea1b321f42988b407091065a2539#r487140171)

### Why are the changes needed?
Delete the un used code

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
Existing UT

Closes #29736 from sandeep-katta/deadlockfollowup.

Authored-by: sandeep.katta <sandeep.katta2007@gmail.com>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
(cherry picked from commit 2009f95)
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>

sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveShim.scala

@@ -1327,8 +1327,6 @@ private[client] class Shim_v3_0 extends Shim_v2_3 {
       inheritTableSpecs: Boolean,
       isSkewedStoreAsSubdir: Boolean,
       isSrcLocal: Boolean): Unit = {
-    val session = SparkSession.getActiveSession
-    assert(session.nonEmpty)
     val table = hive.getTable(tableName)
     val loadFileType = if (replace) {
       clazzLoadFileType.getEnumConstants.find(_.toString.equalsIgnoreCase("REPLACE_ALL"))