Fix trim deprecation on a special UUID column case where we trim without knowing if it is a string yet

[DiegoPino]

What?

Happens at in the AMI Utility Service at

ami/src/AmiUtilityService.php

Line 1019 in 892a334

if (empty(trim($row[$haskey])) || !Uuid::isValid(trim($row[$haskey]))) {

Since I (weird) never ever hit that line of code (it is quite an Exception after all the ifs) I need to investigate which CSV shape triggers it, but the fix is easy.

Convert
if (empty(trim($row[$haskey])) || !Uuid::isValid(trim($row[$haskey]))) {

To

if (isset($row[$haskey])) first, then check if its a string, then check the actual validity.

Basically avoid trimming until we know it is a string. I wish PHP had not deprecated trimming NULLs.

[DiegoPino]

Solved via 448569c