Replaced empty strings by NULLs in non-text assert macros
Replaced empty strings by NULLs in non-text assert macros

PaulBussmann/cpputest,Mindtribe/cpputest,offa/cpputest,PaulBussmann/cpputest,cpputest/cpputest,bithium/cpputest,offa/cpputest,arstrube/cpputest,cpputest/cpputest,chenlianbing/cpputest,Mindtribe/cpputest,bithium/cpputest,arstrube/cpputest,Andne/cpputest,bithium/cpputest,KisImre/cpputest,maxilai/cpputest,asgeroverby/cpputest,offa/cpputest,maxilai/cpputest,devMichaelJones/cpputest,KisImre/cpputest,jaeguly/cpputest,PaulBussmann/cpputest,KisImre/cpputest,Andne/cpputest,jaeguly/cpputest,jaeguly/cpputest,jaeguly/cpputest,devMichaelJones/cpputest,basvodde/cpputest,asgeroverby/cpputest,arstrube/cpputest,maxilai/cpputest,Mindtribe/cpputest,Andne/cpputest,basvodde/cpputest,asgeroverby/cpputest,bithium/cpputest,offa/cpputest,PaulBussmann/cpputest,cpputest/cpputest,devMichaelJones/cpputest,Andne/cpputest,chenlianbing/cpputest,basvodde/cpputest,basvodde/cpputest,arstrube/cpputest,KisImre/cpputest,Mindtribe/cpputest,maxilai/cpputest,asgeroverby/cpputest,devMichaelJones/cpputest,chenlianbing/cpputest,cpputest/cpputest,chenlianbing/cpputest