Avoid unhelpful 'Binary file ... matches' output instead of error information
Avoid unhelpful 'Binary file ... matches' output instead of error information

...when grep happens to consider the log file to be binary (for whatever reason)
as can be obvserved to happen on Linux-RHEL6-x86_64@14-with-check tinderbox.

Change-Id: I5da0a792b45b83939c9c26897d30ddf8b0a0c0b0

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core