Undefined array keys warnings when activities of a contact are listed
When you open a contact and click on the tab "Activities" we see the following warnings in watchdog regardless of how many activities are listed there.
Warning: Undefined array key "addAssigneeContact" in include() (Zeile 7 in C:\wamp64\www\civicrm\httpdocs\sites\default\files\private\civicrm\templates_c\en_US\%%E3\E36\E366782B%%Tab.tpl.php)
Warning: Undefined array key "addTargetContact" in include() (Zeile 7 in C:\wamp64\www\civicrm\httpdocs\sites\default\files\private\civicrm\templates_c\en_US\%%E3\E36\E366782B%%Tab.tpl.php)
Warning: Undefined array key "hideRelativeLabel" in include() (Zeile 9 in C:\wamp64\www\civicrm\httpdocs\sites\default\files\private\civicrm\templates_c\en_US\%%48\480\480BECF5%%DatePickerRange.tpl.php)