Release 2.6.0 (#4472)

- Added: calendar entry title combination for customer, project and activity
- Added: show not_invoiced and not_exported data in detail screens
- Added: force logout if user is disabled
- Added: reduced amount of database queries on several screens
- Fixed: open-close status on work-contract screen for users without configuration
- Fixed: failsafe order/orderBy in query if manually manipulated to be null
- Fixed: unify statistic calculation (not_invoiced and not_exported) across screens
- Tech: bump packages
- Tech: Symfony 6.4

src/Configuration/SystemConfiguration.php

@@ -482,10 +482,10 @@ final class SystemConfiguration
         return (bool) $this->find('theme.avatar_url');
     }
 
-    public function getThemeColorChoices(): ?string
+    public function getThemeColorChoices(): string
     {
         $config = $this->find('theme.color_choices');
-        if (!empty($config)) {
+        if (\is_string($config) && $config !== '') {
             return $config;
         }