Replaced empty string by NULLs in TestHarness_c.cpp
Replaced empty string by NULLs in TestHarness_c.cpp

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