Matcher fails when trying to use empty string as a pattern

[jkobus]

Using value like:

{"name": "123"}

for pattern:

{"name": ""}

results in:

TypeError: Argument 1 passed to Coduo\PHPMatcher\Parser::unexpectedSyntaxError() must be of the type array, null given, called in /home/jacek/workspace/php-matcher/src/Parser.php on line 66

/home/jacek/workspace/php-matcher/src/Parser.php:252
/home/jacek/workspace/php-matcher/src/Parser.php:66
/home/jacek/workspace/php-matcher/src/Parser.php:54
/home/jacek/workspace/php-matcher/src/Parser.php:29
/home/jacek/workspace/php-matcher/src/Matcher/StringMatcher.php:43
/home/jacek/workspace/php-matcher/src/Matcher/ChainMatcher.php:32
/home/jacek/workspace/php-matcher/src/Matcher/ChainMatcher.php:33
/home/jacek/workspace/php-matcher/src/Matcher/ArrayMatcher.php:165
/home/jacek/workspace/php-matcher/src/Matcher/ArrayMatcher.php:88
/home/jacek/workspace/php-matcher/src/Matcher/ArrayMatcher.php:46
/home/jacek/workspace/php-matcher/src/Matcher/ChainMatcher.php:33
/home/jacek/workspace/php-matcher/src/Matcher/JsonMatcher.php:35
/home/jacek/workspace/php-matcher/src/Matcher/ChainMatcher.php:33
/home/jacek/workspace/php-matcher/src/Matcher.php:20
/home/jacek/workspace/php-matcher/tests/MatcherTest.php:448

The problem seems to be in the doctrine's AbstractLexer::scan($input):245 that is unable to detect the empty string, therefore the $this->lexer->lookahead used in Parser:61 is null, and that causes the TypeError: Argument 1 passed to Coduo\PHPMatcher\Parser::unexpectedSyntaxError() must be of the type array, null given when trying to raise the unexpectedSyntaxError (PatternException).

I am not very familiar with doctrine's lexer; I tried to force it to detect the empty string by modifying getCatchablePatterns but with no results - though I think, It might be possible.