Fixed Call to a member function checkedOutToUser() on null [rollbar-3598]

[inietov]

Description

In #13574 I added a call to the Asset::checkedOutToUser() function to decide if show an asset in the Unaccepted Asset report. But I turned out to introduce a bug when the asset is deleted before the user accept it.

I added a boolean to be set by the function if the asset still exists, and if not I passed it as false, so that register also get filetered in the report.

Fixes rollbar 3598

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Test Configuration:

• PHP version: 8.1
• MySQL version: 8.0.31
• Webserver version: PHP Dev Server
• OS version: Debian 12

[what-the-diff]

PR Summary

• Inclusion of an Additional Condition in ReportsController.php
  A safeguard check has been added in the reports controller. The modification ensures that the system checks if the property 'checkoutable' is in place before it tries to execute the 'checkedOutToUser()' method. This helps in preventing any undesired system errors or crashes that could potentially occur if the property isn't available when the method is called.