Handle getNextMeaningfulToken returning NULL

[aschempp]

The screenshotted file below currently fails the parser because there is no meaningful token after the chained method block. It results in a fail with message

[ERROR] System error: "Fixing of "./contao/dca/tl_settings.php" file by        
         "Contao\EasyCodingStandard\Fixer\ChainedMethodBlockFixer" failed:      
         Illegal offset type in file                                            
         tools/ecs/vendor/contao/easy-coding-stand
         ard/src/Fixer/ChainedMethodBlockFixer.php on line 121"Run ECS with     
         "--debug" option and post the report here: https://github.com/symplify/symplify/issues/new in
         ./contao/dca/tl_settings.php:159    

[leofeyer]

Thank you @aschempp.