Invalid always exists variable with SOAP call reported

[liborm85]

Bug report

After update phpstan to 0.12.83 is reported error Variable $response in isset() always exists and is not nullable..
Soap call $soapClient->test() can throw exception and $response may be undefined, see snippet.

In my phpstan.neon is SOAP calls ignored (as suggested in #262 (comment)):

  ignoreErrors:
    - '#Call to an undefined method SoapClient::#'

Code snippet that reproduces the problem

https://phpstan.org/r/1f61e3a6-f629-4edf-a4f0-075ff4c4f1f7

Expected output

13 | Call to an undefined method SoapClient::test().

Actual output

13 | Call to an undefined method SoapClient::test().
19 | Variable $response in isset() always exists and is not nullable.

[ondrejmirtes]

Fixed (including the undefined method): phpstan/phpstan-src@f6107ad

[github-actions]

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