#242 - Fix InputFileReaderTask: explicit exception when no file path is given as input

[njoubert-cleverage]

Description

Fixes #242.

InputFileReaderTask::getOptions() only set filename when the input was not null, and the filename option is removed from the resolver: with a null (or non-string) input, FileReaderTask::execute() read an undefined key (PHP warning Undefined array key "filename") then file_exists(null) threw a TypeError.

• getOptions() now throws \UnexpectedValueException('No file path given as input') when the input is not a non-empty string, consistent with InputFolderBrowserTask since Edge cases looping forever or failing with a TypeError: FileSplitterTask, PropertySetterTask, SlugifyTransformer, InputFolderBrowserTask, XmlFile #232;
• as AbstractConfigurableTask::initialize() calls getOptions() before any input exists, initialize() is overridden to only validate the options (parent::getOptions()), the same way InputFolderBrowserTask does;
• document it in docs/reference/tasks/input_file_reader_task.md;
• add InputFileReaderTaskTest::testThrowsWhenNoFilePathIsGivenAsInput for null, '' and an array (all fail on main).

PHPUnit (804 tests), PHPStan, PHP-CS-Fixer and Rector pass, and the changed files are valid PHP 8.2.

Requirements

• Documentation updates
  • Reference
  • Cookbooks
  • Changelog
• Unit tests

Breaking changes

None: a null or non-string input currently ends with a TypeError. An empty string '' already threw an \UnexpectedValueException, only its message changes (No file path given as input instead of File does not exists: '').

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