[5.1] DateTime: Don't convert when there is no user

[Hackwar]

Pull Request for Issue #43511 .

Summary of Changes

When you have a custom field set to be indexed in Smart Search and run that indexing process in the CLI, it will fail because the CLI process doesn't have a user object. The failure happens in the HTMLHelper::date() method and this PR simply checks if there is a user object to get the timezone from.

Testing Instructions

1. Create a custom field of type calendar for your articles and set it to be indexed by Smart Search
2. Run php cli/joomla.php finder:index on the command line

Actual result BEFORE applying this Pull Request

Fatal error in HTMLHelper::date()

Expected result AFTER applying this Pull Request

Indexing works as expected.

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

[ceford]

I have tested this item ✅ successfully on b031b01

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[viocassel]

I have tested this item ✅ successfully on b031b01

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43521.}

[Quy]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43521.}

[bembelimen]

Thx