merged branch Tobion/refactor-core-ext (PR #907)
merged branch Tobion/refactor-core-ext (PR #907)

This PR was merged into the master branch.

Commits
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6deee76 refactor test_empty and in_filter

Discussion
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refactor test_empty and in_filter

robregonm/Twig,moltin/Twig,Tobion/Twig,Rvanlaak/Twig,gencer/Twig,markstory/Twig,craue/Twig,phansys/Twig,iKwinto/Twig,hhamon/Twig,Rvanlaak/Twig,znerol/Twig,derickr/Twig,gamernetwork/Twig,gencer/Twig,Tobion/Twig,nicolas-grekas/Twig,framewr/Twig,dkarvounaris/Twig,apishka/templater,robregonm/Twig,framewr/Twig,phansys/Twig,derickr/Twig,gamernetwork/Twig,markstory/Twig,bocharsky-bw/Twig,Rvanlaak/Twig,apishka/templater,moufmouf/Twig,huang53798584/Twig,fsw/Twig,peterkokot/Twig,znerol/Twig,moufmouf/Twig,dkarvounaris/Twig,robregonm/Twig,nicolas-grekas/Twig,iKwinto/Twig,craue/Twig,framewr/Twig,hhamon/Twig,bocharsky-bw/Twig,loi-chuanoi/Twig,moltin/Twig,peterkokot/Twig,dkarvounaris/Twig,jamessingizi/Twig,bocharsky-bw/Twig,hason/Twig,twigphp/Twig,nicolas-grekas/Twig,nicolas-grekas/Twig,znerol/Twig,twigphp/Twig,moltin/Twig,fsw/Twig,hhamon/Twig,Tobion/Twig,huang53798584/Twig,hason/Twig,fsw/Twig,derickr/Twig,jamessingizi/Twig,jamessingizi/Twig,nicolas-grekas/Twig,gamernetwork/Twig,iKwinto/Twig,moufmouf/Twig,huang53798584/Twig,twigphp/Twig,hason/Twig