Nesting of if statements in handle_course

[tobiasreischmann]

I would suggest an a bit more readable version of the if statement nesting in handle course.
Either:

if ($intable === false && $hasrole === false) {
  \\ Code
} else if ($intable === false && $hasrole === false) {
  \\ Code
} else if ($intable === false && $hasrole === false) {
  \\ Code
}
return false;

or

if ($intable === true) {
    if ($hasrole === true) {
        \\ Code
    } else {
        \\ Code
    }
} else {
    if ($hasrole === true) {
        \\ Code
    } else {
        \\ Code
    }
}