Pull Request for Issue # .

Summary of Changes

Extensions can use the ListView class without defining a filter form. In this case, the $filterForm property remains null, which can lead to a fatal error when the view attempts to access it without a null check.

This PR adds a guard check to safely handle the absence of a filter form and prevent a fatal error.

Testing Instructions

• Use Joomla 6
• Install the attached com_items component. It is a very basic component created by Gitub copilot for testing
  com_items.zip
• Access to Components -> Items

Actual Result BEFORE Applying This Pull Request

You got fatal error Call to a member function addControlField() on null due to missing null check in ListView class

Expected Result AFTER Applying This Pull Request

No error anymore. You see a screen displays list of items (empty until you add items to it). You might see a warning Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in but ignore it for now. The main thing is fatal error is sorted by this PR.

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed