Add error message when SQL query failed

[nboisteault]

@rldhont @mdouchin
I think we should an error message for the user here.
I just had a case where an update query did not return $pkvals because some triggers avoided the update. Any suggestion?

lizmap-web-client/lizmap/modules/lizmap/controllers/edition.classic.php

Line 735 in 48c984e

// Redirect to the display action

[Gustry]

We got some progress in #3831

[Gustry]

@nboisteault Did you still replicate this issue ?
I made a very very quick fix in #5118, it just to add a log, even if we don't know the reason at this stage. But looking at the source code of saveToDb, we should have some logs if I'm not wrong.

lizmap-web-client/lizmap/modules/lizmap/lib/Form/QgisForm.php

Line 896 in f004d06

public function saveToDb($feature = null, $modifiedControls = array())