[sr-dev] [kamailio/kamailio] s.select transformation not returning null for nonexistent indexes (#2128)

[Daniel-Constantin Mierla]

The example is wrong, indeed -- iirc, the transformations were not returning `$null` in the initial design, because they were supposed to be a property of a valid value. Not sure if there is any transformation returning `$null` right now.

However, changing this behaviour might break other existing configs, so this has to be discussed and analyzed properly.

Right now probably the `{s.count,;}` should be used to get what is the max index.

  * https://www.kamailio.org/wiki/cookbooks/5.3.x/transformations#scount_c

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