Bert Freudenberg uploaded a new version of Tools to project The Trunk:
http://source.squeak.org/trunk/Tools-bf.701.mcz

==================== Summary ====================

Name: Tools-bf.701
Author: bf
Time: 11 May 2016, 6:58:52.388945 pm
UUID: e40b6bec-177e-4bf9-88fb-4149c8cf2391
Ancestors: Tools-bf.700

Debugger: if stack is empty show nothing, not 'nil'

=============== Diff against Tools-bf.700 ===============

Item was changed:
  ----- Method: ContextVariablesInspector>>contentsIsString (in category 'selecting') -----
  contentsIsString
  	"Hacked so contents empty when deselected and = long printString when item 3"
  
+ 	^ (selectionIndex = 3) | (selectionIndex = 0) |
+ 		(selectionIndex = 2 and: [object actualStackSize = 0])!
- 	^ (selectionIndex = 3) | (selectionIndex = 0)!

Item was changed:
  ----- Method: ContextVariablesInspector>>selection (in category 'selecting') -----
  selection 
  	"Refer to the comment in Inspector|selection."
  	selectionIndex = 0 ifTrue:[^''].
  	selectionIndex = 1 ifTrue: [^object].
+ 	selectionIndex = 2 ifTrue: [^object actualStackSize > 0 ifTrue: [object top] ifFalse: ['']].
- 	selectionIndex = 2 ifTrue: [^object stackPtr > object method numTemps ifTrue: [object top]].
  	selectionIndex = 3 ifTrue: [^object tempsAndValues].
  	^object debuggerMap namedTempAt: selectionIndex - 3 in: object!