[KYUUBI #692] Simplify construct of KyuubiException

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### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

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Closes #692 from pan3793/construct.

Closes #692

9803aee [Cheng Pan] Simplify construct of KyuubiException

Authored-by: Cheng Pan <379377944@qq.com>
Signed-off-by: Kent Yao <yao@apache.org>

kyuubi-common/src/main/scala/org/apache/kyuubi/KyuubiException.scala

@@ -17,7 +17,4 @@
 
 package org.apache.kyuubi
 
-class KyuubiException(message: String, cause: Throwable) extends Exception(message, cause) {
-
-  def this(message: String) = this(message, null)
-}
+class KyuubiException(message: String, cause: Throwable = null) extends Exception(message, cause)