fix "strpos empty needle" warning #2
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fixes issue greenlion#320 a warning was issued in `PositionCalculator#findPositionWithinString` when calling `strpos` on an empty value: ``` Warning: strpos(): Empty needle in src/PHPSQLParser/positions/PositionCalculator.php on line 138 ``` => return `false` earlier in that case, to then throw an exception
PHP Parse error: syntax error, unexpected 'class' (T_CLASS), expecting
identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' in
/home/travis/build/greenlion/PHP-SQL-Parser/tests/cases/parser/issue320Test.php
on line 55
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fixes issue greenlion#320
a warning was issued in
PositionCalculator#findPositionWithinStringwhen calling
strposon an empty value:=> return
falseearlier in that case, to then throw an exception