fix(store) add nil processing in lt function

[illia-li]

Currently 'nil' come results panic:

{"L":"INFO","T":"2023-06-21T10:55:08.476-0400","N":"work cycle.validation_job","M":"Retring failed validation. 1 attempt from 10 attempts. Error: row count differ (test has 59 rows, oracle has 60 rows, test is missing rows: [pk16=45604486-11-25 23:27:42.51 +0000 UTC, \tpk17=3h50m24.065357675s, \tpk18=2130-04-03 00:00:00 +0000 UTC, \tpk19=52d8145cd62ff63, \tck=1829966953], oracle is missing rows: [])"}
{"L":"INFO","T":"2023-06-21T10:55:09.348-0400","N":"work cycle.validation_job","M":"ending validation loop"}
panic: unhandled type <nil>

[dkropachev]

it does not work, it is type casting, while nil is value

[illia-li]

nil - not value, nil- predictable identifier. This work or not work only experience shows, try this:

func main() {
	fmt.Println(nilDetecting(nil))
}

func nilDetecting(in interface{}) bool {
	switch in.(type) {
	case nil:
		return true
	default:
		return false
	}
}

output: true