Attempting to open a file that does not exist creates that file unnecessarily

[zach-cloud]

When JMPQ3 attempts to open a file that does not exist, it creates a 0 byte file with the name that was attempted to be opened.

This is due to the use of FileChannel: https://docs.oracle.com/javase/7/docs/api/java/nio/channels/FileChannel.html#open(java.nio.file.Path,%20java.nio.file.OpenOption...)

Therefore as a user, I'd like the program to check for the existence of the file and throw an exception immediately before attempting to open it so that I don't get files created when I try to open a file that doesn't exist.