[sr-dev] [kamailio/kamailio] pv: log uninit $var() (PR #3114)

[Stefan Mititelu]

Consider this scenario:
1'st part:
```
if (is_present_hf("SOME_HEADER")) {
    $var(data) = _get_data_from_some_header_;
}
```

2'nd part, later:
```
if ($var(data) != "") {
    _do_something_with_data_
}
```

2'nd part gets called even for SIP that does not have  SOME_HEADER header, with value set in previous SIP that had SOME_HEADER.

I wanted to log a warning for this, so if SIP with no SOME_HEADER header comes in first, in one routing process, I will see the warning log and know to set ```$var(data)="";``` before the 1'st part.

Thank you,
Stefan

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