Fixed issue# 766 

Avoid search of private notebooks.
That's a different issue - Gordon's point is that you have `isTRUE(x == TRUE)` which is the same as `isTRUE(x)`. FWIW the `isTRUE()` piece is a guard to assume anything but `TRUE` is to be taken as `FALSE` (including empty vectors, `NA`s etc.). It should be only used in cases where you can logically assume `FALSE` on invalid input instead of an error.