Handle DB errors in users latest module

[alikon]

updated to handle DB errors like #6612 ,#6632, #6665 and for #6591

Testing info
set the db offline
or
simulate a db error
change line 37 from

->from('#__users AS a');

to

->from('#__users AS z');

before patch you get

after you get
the module is not displayed

[davdebcom]

@test
Works, after patch you don't see a SQL error anymore.

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[ghost]

Not sure if this should get merged with regards to discussion on #6710

[anibalsanchez]

@test OK, no frontend SQL error showing internal information

(though it would be nice to show a generic error... instead of eating the excepton)

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[zero-24]

@alikon can you add the generic message also here? Like: https://github.com/joomla/joomla-cms/pull/6700/files

[alikon]

@anibalsanchez , @zero-24 thx for reporting
the generic msg was added

[zero-24]

RTC Thanks 😄

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