Silent failure with invalid hba_file setting

Hi,

I noticed that if the hba_file setting in the config is uncommented
and set to a directory instead of the full path to the file, no error
occurs when the service starts.

For example:

hba_file = '/home/thom/Development/data'

The problem with this is you cannot get into the database as it acts
as if it did find the hba file but found it empty.

Shouldn't a check be in place to ensure that the parameter resolves to
a file rather than anything else? And even if it does find a file,
but it's empty, shouldn't it also produce a warning of some kind?

--
Thom Brown
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