Check if com_fields is installed

[Bakual]

Pull Request for Issue #15401 .

Summary of Changes

Simple fix to prevent the message Warning Error loading component: com_fields, Component not found. from showing.
It doesn't necessary fix the potential underlying issue that com_fields isn't installed

Testing Instructions

If you got that message after updating, apply this PR and the message is gone

Documentation Changes Required

None

[mbabker]

Can you do this so JComponentHelper::isInstalled('com_fields') is only called once? JComponentHelper::isInstalled() doesn't cache results so this in effect is adding two duplicate database queries to every admin page load right now, putting it in a variable at least brings it down to one non-duplicate (at least generated by this source).

[zero-24]

In oder to fix the drone error and the comment by michael what about using: $fields = JComponentHelper::isInstalled('com_fields') && JComponentHelper::isEnabled('com_fields');

And later: if ($fields && JComponentHelper::getParams('com_users')->get('custom_fields_enable', '1')) or if ($fields && JComponentHelper::getParams('com_content')->get('custom_fields_enable', '1'))

[Bakual]

Done. I've chosen a different variable name so it's more clear.

[zero-24]

👍 Can you get that in 3.7.0 @rdeutz ?

[rdeutz]

@zero-24 did you test if it works?

[rjcf18]

I have tested this item ✅ successfully on f61d85b

Seems to have fixed the message that appears after updating.

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[zero-24]

I have tested this item ✅ successfully on f61d85b

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/15465.}

[zero-24]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/15465.}

[zero-24]

yes @rdeutz

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/15465.}

[mcintyro]

I did the production upgrade to 3.7.0 from 3.6.5 and I have this warning on my admin console. The update was delivered using the Joomla Updater - I am not a developer so not sure if this issue was expected in 3.7.0 production or how to resolve it.

[l-arnold]

Ditto to Mcintyro above "production upgrade to 3.7.0 from 3.6.5"

Coupled with this I suspect FlexiContent is also problmatic with new com_fields behavior Basically I cannot find any "com_fields" but Joomla keeps giving the error:

Warning
Error loading component: com_fields, Component not found.