Fix #81720: Uninitialized array in pg_query_params() leading to RCE

We must not free parameters which we haven't initialized yet.

We also fix the not directly related issue, that we

Fix #81720: Uninitialized array in pg_query_params() leading to RCE

We must not free parameters which we haven't initialized yet.

We also fix the not directly related issue, that we checked for the
wrong value being `NULL`, potentially causing a segfault.

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