Exception, wenn man kein Ticket auswählt

Man sucht ein Ticket, wählt dann nichts aus und klickt auf "Ticket ins Gitlab migrieren"

Houston, we've got a problem.
Typ: TypeError
Nachricht: Argument 1 passed to TracToGitlab\TracLookup::getChanges() must be of the type integer, null given, called in /home/studip/studip-git/public/plugins_packages/UOL/TracToGitlabPlugin/controllers/convert.php on line 77
Code: 0
Stack trace:
#$ public/plugins_packages/UOL/TracToGitlabPlugin/lib/TracLookup.php(40)
#0 public/plugins_packages/UOL/TracToGitlabPlugin/controllers/convert.php(77): TracToGitlab\TracLookup->getChanges(NULL)
#1 vendor/trails/trails.php(557): ConvertController->convert_action()
#2 app/controllers/studip_controller.php(110): Trails_Controller->perform('convert')
#3 vendor/trails/trails.php(154): StudipController->perform('convert')
#4 vendor/trails/trails.php(121): Trails_Dispatcher->map_uri_to_response('convert/convert')
#5 lib/plugins/core/StudIPPlugin.class.php(166): Trails_Dispatcher->dispatch('convert/convert')
#6 public/plugins_packages/UOL/TracToGitlabPlugin/TracToGitlabPlugin.php(51): StudIPPlugin->perform('convert/convert')
#7 public/plugins.php(54): TracToGitlabPlugin->perform('convert/convert')
#8 {main}
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