Fix undefined property enable_autocomplete warning

Add isset() check for enable_autocomplete property to handle
cases where database migration has not been applied yet.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

admin/anlage_types.php

@@ -595,7 +595,8 @@ if (in_array($action, array('create', 'edit'))) {
 					print '<td class="center"><span style="color:#888;">-</span></td>';
 				}
 				print '<td class="center">'.($field->show_in_hover ? img_picto('', 'tick') : '').'</td>';
-				print '<td class="center">'.($field->enable_autocomplete ? '<i class="fa fa-magic" style="color:#3498db;" title="Autocomplete aktiv"></i>' : '').'</td>';
+				$enableAutocomplete = isset($field->enable_autocomplete) ? $field->enable_autocomplete : 0;
+				print '<td class="center">'.($enableAutocomplete ? '<i class="fa fa-magic" style="color:#3498db;" title="Autocomplete aktiv"></i>' : '').'</td>';
 				print '<td class="center">'.($field->required ? img_picto('', 'tick') : '').'</td>';
 				print '<td class="center">'.$field->position.'</td>';
 				print '<td class="center">';