bug #33172 [Console] fixed a PHP notice when there is no function in …

…the stack trace of an Exception (fabpot)

This PR was merged into the 3.4 branch.

Discussion
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[Console] fixed a PHP notice when there is no function in the stack trace of an Exception

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| BC breaks?    | no     <!-- see https://symfony.com/bc -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

Under certain circumstances, the `function` is not present in the stack trace. That's the case for instance when an error occurs on a line like this one `return require "somefile";`.

Commits
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ddb4735 [Console] fixed a PHP notice when there is no function

src/Symfony/Component/Console/Application.php

@@ -809,11 +809,11 @@ protected function doRenderException(\Exception $e, OutputInterface $output)
                 for ($i = 0, $count = \count($trace); $i < $count; ++$i) {
                     $class = isset($trace[$i]['class']) ? $trace[$i]['class'] : '';
                     $type = isset($trace[$i]['type']) ? $trace[$i]['type'] : '';
-                    $function = $trace[$i]['function'];
+                    $function = isset($trace[$i]['function']) ? $trace[$i]['function'] : '';
                     $file = isset($trace[$i]['file']) ? $trace[$i]['file'] : 'n/a';
                     $line = isset($trace[$i]['line']) ? $trace[$i]['line'] : 'n/a';
 
-                    $output->writeln(sprintf(' %s%s%s() at <info>%s:%s</info>', $class, $type, $function, $file, $line), OutputInterface::VERBOSITY_QUIET);
+                    $output->writeln(sprintf(' %s%s at <info>%s:%s</info>', $class, $function ? $type.$function.'()' : '', $file, $line), OutputInterface::VERBOSITY_QUIET);
                 }
 
                 $output->writeln('', OutputInterface::VERBOSITY_QUIET);