Fix undefined index

[villfa]

When I run the unit tests of the BetterReflection project I get this error:

1) Roave\BetterReflectionTest\TypesFinder\FindReturnTypeTest::testFindReturnTypeForMethod with data set #2 ('@return array{foo: string|int}', array())
Undefined index: args

/code/BetterReflection/src/TypesFinder/FindReturnType.php:48
/code/BetterReflection/test/unit/TypesFinder/FindReturnTypeTest.php:85

When the error happens $call contains the following array:

array(3) {
  ["file"]=>
  string(41) "/code/BetterReflection/vendor/bin/phpunit"
  ["line"]=>
  int(21)
  ["function"]=>
  string(4) "eval"
}

This modification fixes the problem.

[mvriel]

Thanks for the PR; looking good :) Would it be possible to write a test that can confirm this as a follow up PR?

[villfa]

@mvriel here: #299

[yannickl88]

just ran into this issue while upgrading phpunit. When will there be a release that includes this fix?