FindMatlab: refactor: simplify / correct logic
- Use
if(IS_DIRECTORY)when testing for directories - eliminate redundant
if(var AND ${var})by usingif("${var}") -
file(MAKE_DIRECTORY)needs no IS_DIRECTORY check.
if(IS_DIRECTORY) when testing for directoriesif(var AND ${var}) by using if("${var}")
file(MAKE_DIRECTORY) needs no IS_DIRECTORY check.