Steps to reproduce

1. With search tool
   • Create a search model with repeater as result columns
   • Open the search tool (don't need to launch the search)
   • I get an error on opening.
   • Other tools are unusable in the CMS, I have to refresh my page
2. With Solr search tool
   • Open the Solr search tool
   • Search contents with repeater (like program)
   • Select repeater columns into search results
   • I get these errors in the JS console:

     Entry.js:139 2022-05-23T13:43:20.245Z	ERROR	[Ametys.data.ServerComm]	Une erreur est survenue dans le traitement de la réponse serveur (Ext.grid.column.Column.initComponent(): Ext.grid.column.Column: Group header does not support setting explicit widths. A group header either shrinkwraps its children, or must be flexed.)
      Error: Ext.grid.column.Column: Group header does not support setting explicit widths. A group header either shrinkwraps its children, or must be flexed.
         at new Ext.Error (ext-all.js:2770:21)
         at Function.raise (ext-all.js:2835:23)
         at Object.Ext.raise (ext-all.js:2916:21)
         at constructor.initComponent (ext-all.js:236196:21)
         at constructor (ext-all.js:74158:12)
         at constructor.callParent (ext-all.js:13649:32)
         at constructor (Ext.enhancements.js:2621:15)
         at new constructor (ext-all.js:14564:37)
         at Object.widget (ext-all.js:17082:20)
         at constructor.create (ext-all.js:30401:20)
     traceInConsole @ Entry.js:139
     _log @ Logger.js:214
     error @ Logger.js:148
     display @ ErrorDialog.js:130
     (anonymous) @ ServerComm.js:1094
     Ext.Array.ExtArray.forEach @ ext-all.js:3346
     _dispatch @ ServerComm.js:1079
     _onRequestComplete @ ServerComm.js:957
     callback @ ext-all.js:9638
     onComplete @ ext-all.js:28415
     onStateChange @ ext-all.js:28372
     (anonymous) @ ext-all.js:28362
     elevate @ ext-all.js:2574
     (anonymous) @ ext-all.js:28361
     XMLHttpRequest.send (async)
     start @ ext-all.js:28142
     request @ ext-all.js:29235
     _sendMessages @ ServerComm.js:771
     (anonymous) @ ServerComm.js:432
     setTimeout (async)
     send @ ServerComm.js:432
     _launchSearch @ SolrContentSearchTool.js:373
     callback @ ext-all.js:9638
     fireHandler @ ext-all.js:167196
     onClick @ ext-all.js:167178
     fire @ ext-all.js:22906
     fire @ ext-all.js:37964
     publish @ ext-all.js:37924
     publishDelegatedDomEvent @ ext-all.js:37946
     doDelegatedEvent @ ext-all.js:37990
     onDelegatedEvent @ ext-all.js:37977
     ext-all.js:237007 Uncaught TypeError: Cannot read properties of undefined (reading 'constructing')
         at constructor.hide (ext-all.js:237007:19)
         at constructor.<anonymous> (ContentSearchTool.js:1034:37)
         at constructor.fire (ext-all.js:22906:42)
         at constructor.doFireEvent (ext-all.js:23946:47)
         at constructor.doFireEvent (ext-all.js:75015:48)
         at constructor.prototype.doFireEvent (ext-all.js:66512:31)
         at constructor.fireEventArgs (ext-all.js:23800:26)
         at constructor.fireEvent (ext-all.js:23757:25)
         at constructor.afterLayout (ext-all.js:161210:16)
         at constructor.notifyOwner (ext-all.js:158548:20)
     hide @ ext-all.js:237007
     (anonymous) @ ContentSearchTool.js:1034
     fire @ ext-all.js:22906
     doFireEvent @ ext-all.js:23946
     doFireEvent @ ext-all.js:75015
     prototype.doFireEvent @ ext-all.js:66512
     fireEventArgs @ ext-all.js:23800
     fireEvent @ ext-all.js:23757
     afterLayout @ ext-all.js:161210
     notifyOwner @ ext-all.js:158548
     callLayout @ ext-all.js:265093
     flushLayouts @ ext-all.js:265242
     runComplete @ ext-all.js:265803
     callOverrideParent @ ext-all.js:1592
     callParent @ ext-all.js:13649
     runComplete @ ext-all.js:72252
     run @ ext-all.js:265790
     flushLayouts @ ext-all.js:72260
     resumeLayouts @ ext-all.js:72275
     Ext.resumeLayouts @ ext-all.js:78255
     _dispatch @ ServerComm.js:1116
     _onRequestComplete @ ServerComm.js:957
     callback @ ext-all.js:9638
     onComplete @ ext-all.js:28415
     onStateChange @ ext-all.js:28372
     (anonymous) @ ext-all.js:28362
     elevate @ ext-all.js:2574
     (anonymous) @ ext-all.js:28361
     XMLHttpRequest.send (async)
     start @ ext-all.js:28142
     request @ ext-all.js:29235
     _sendMessages @ ServerComm.js:771
     (anonymous) @ ServerComm.js:432
     setTimeout (async)
     send @ ServerComm.js:432
     _launchSearch @ SolrContentSearchTool.js:373
     callback @ ext-all.js:9638
     fireHandler @ ext-all.js:167196
     onClick @ ext-all.js:167178
     fire @ ext-all.js:22906
     fire @ ext-all.js:37964
     publish @ ext-all.js:37924
     publishDelegatedDomEvent @ ext-all.js:37946
     doDelegatedEvent @ ext-all.js:37990
     onDelegatedEvent @ ext-all.js:37977
     ServerComm.js:1090 Uncaught Error: Ext.grid.column.Column: Group header does not support setting explicit widths. A group header either shrinkwraps its children, or must be flexed.
         at new Ext.Error (ext-all.js:2770:21)
         at Function.raise (ext-all.js:2835:23)
         at Object.Ext.raise (ext-all.js:2916:21)
         at constructor.initComponent (ext-all.js:236196:21)
         at constructor (ext-all.js:74158:12)
         at constructor.callParent (ext-all.js:13649:32)
         at constructor (Ext.enhancements.js:2621:15)
         at new constructor (ext-all.js:14564:37)
         at Object.widget (ext-all.js:17082:20)
         at constructor.create (ext-all.js:30401:20)

   • Other tools are unusable in the CMS, I have to refresh my page

Note: It seems to be OK on 4.5.2.