Refactor: "if defined" and "if not defined" to be easier to use in fake program.

Refactor: "if defined" and "if not defined" to be easier to use in fake program.

Using "if not defined parameter work" can be confusing.
Using "if not parameter work" is shorter and easier to understand.

Using "if defined environment PATH" can be very confusing.
Using "if define PATH" is shorter and a lot easier to understand.

Break apart the "if defined" (and "if not defined") logic into two operations:
1) "if define" (and "if not define").
2) "if parameter" (and "if not parameter").

This makes the behavior easier to understand as it directly maps to the "defined" and "parameter" settings.