A new version of CommandLine was added to project The Inbox:
http://source.squeak.org/inbox/CommandLine-ct.18.mcz

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

Name: CommandLine-ct.18
Author: ct
Time: 21 November 2020, 8:33:12.860056 pm
UUID: 35f67ed2-f5ea-5741-b2fe-2bcfb5f60107
Ancestors: CommandLine-TheresaHMartenK.17

Fixes a nil bug in CommandLineToolSet when debugging a process without extra contents. nil is a valid argument for contents. See Process >> #debug:title:full: and senders.

=============== Diff against CommandLine-TheresaHMartenK.17 ===============

Item was changed:
  ----- Method: CommandLineToolSet class>>debugProcess:context:label:contents:fullView: (in category 'debugging') -----
  debugProcess: aProcess context: aContext label: aString contents: contents fullView: aBool
  	"We can't open a command line debugger, so just log the error and carry on."
  
  	| s |
  	s := FileStream stderr.
  	s
  		nextPutAll: self className;
  		nextPutAll: ': ';
  		nextPutAll: aString;
- 		cr;
- 		nextPutAll: contents;
  		cr.
+ 	contents ifNotNil: [
+ 		s
+ 			nextPutAll: contents;
+ 			cr].
  	(aContext stackOfSize: 20) do: [:ctx | ctx printOn: s. s cr].
  	s flush.!