Merge pull request #31 from pankaj-bind/fix-pr-13

Fix pr 13

Author: jordanmontt

src/Containers-AVL-Tree-Tests/CTAVLTreeTest.class.st

@@ -46,12 +46,6 @@ CTAVLTreeTest >> testAddForRRrotation [
 	self assert: data asArray equals: { 1. 2. 3 }
 ]
 
-{ #category : 'tests' }
-CTAVLTreeTest >> testAddNilRaisesError [
-    self should: [ tree add: nil ] raise: Error withExceptionDo: [ :ex |
-        self assert: ex messageText equals: 'Cannot add nil to AVLTree' ]
-]
-
 { #category : 'tests' }
 CTAVLTreeTest >> testAddOneElement [
 

src/Containers-AVL-Tree/CTAVLTree.class.st

@@ -33,7 +33,6 @@ Class {
 
 { #category : 'adding' }
 CTAVLTree >> add: newObject [
-    newObject ifNil: [ Error signal: 'Cannot add nil to AVLTree' ].
     root := root addChild: newObject.
     ^ newObject
 ]