Dropping a course as a master's student
The only repercussion you need to worry about is how much dropping the class will affect your standing in your program. If your program/school/advisor are okay with you dropping the class I see no further harm that will come from it. 

This being said, you will of course miss out on what is being taught in the class, which may indirectly affect your ability to get a job since you do not have some sort of required skill. 

But again, I have never had an employer ask me why I withdrew from a class.