Error message after changing the series metadata

[ralede]

Describe the bug
After creating a series, an error message appears when you change the metadata

To Reproduce
Steps to reproduce the behavior:

1. create a new opencast object
2. create a new series or choose an existing one
3. click on save
4. try to change the metadata (e.g. title)
5. the error message appears

Expected behavior
successful change of the metadata

Log
Error thrown with message "Call to a member function addToAcls() on null"

Stacktrace:
#10 Error in /var/www/ilias/Customizing/global/plugins/Services/Repository/RepositoryObject/OpenCast/classes/Series/class.xoctSeriesGUI.php:203
#9 xoctSeriesGUI:updateGeneral in /var/www/ilias/Customizing/global/plugins/Services/Repository/RepositoryObject/OpenCast/classes/class.xoctGUI.php:46
#8 xoctGUI:performCommand in /var/www/ilias/Customizing/global/plugins/Services/Repository/RepositoryObject/OpenCast/classes/class.xoctGUI.php:35
#7 xoctGUI:executeCommand in /var/www/ilias/Customizing/global/plugins/Services/Repository/RepositoryObject/OpenCast/classes/Series/class.xoctSeriesGUI.php:94
#6 xoctSeriesGUI:executeCommand in /var/www/ilias/Services/UICore/classes/class.ilCtrl.php:217
#5 ilCtrl:forwardCommand in /var/www/ilias/Customizing/global/plugins/Services/Repository/RepositoryObject/OpenCast/classes/class.ilObjOpenCastGUI.php:156
#4 ilObjOpenCastGUI:executeCommand in /var/www/ilias/Services/UICore/classes/class.ilCtrl.php:217
#3 ilCtrl:forwardCommand in /var/www/ilias/Services/Repository/classes/class.ilObjPluginDispatchGUI.php:45
#2 ilObjPluginDispatchGUI:executeCommand in /var/www/ilias/Services/UICore/classes/class.ilCtrl.php:217
#1 ilCtrl:forwardCommand in /var/www/ilias/Services/UICore/classes/class.ilCtrl.php:178
#0 ilCtrl:callBaseClass in /var/www/ilias/ilias.php:23

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-- POST Data --

form_input_2 : testserie20230314b
form_input_3 :
form_input_4 : Testraum Rainer
form_input_5 : Rainer Ledermann
form_input_8 :
form_input_9 : 0
form_input_11 : checked

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-- Environment Variables --

empty

Environment (please complete the following information):

• ILIAS version: v7.18 2023-02-01
• PHP version: 7.3
• Plugin version: 5.1.0
• Opencast version 13.0.0 (educast.nrw)
• Browser: firefox, chrome

Additional context
the same message also appears when using the development branch

[dagraf]

Thank you for reporting. Can you please post your configuration of the "Series metadata" (see plugin config tab "Metadata", subtab "Series"?

[ralede]

Here is a screenhot of the series metadata

[dagraf]

@ralede: Since we are not yet on OC-13: Could you please test the fix #155? Thx!

[ralede]

By creating a permission template, it works with Opencast 13 (educast.nrw). Thank you!