[4] use correct object to get message from

[PhilETaylor]

Summary of Changes

There is no such method as $db->getMessage() - one assumes you are trying to get the exception message?

Testing Instructions

Code review

Actual result BEFORE applying this Pull Request

The code would fatal error if this exception block was ever invoked

Expected result AFTER applying this Pull Request

The exception would be correctly reported

Documentation Changes Required

none

[sandewt]

I have tested this item ✅ successfully on c9998f3

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[Quy]

I have tested this item ✅ successfully on c9998f3

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/37213.}

[Quy]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/37213.}

[richard67]

Thanks.