Handling of a newline in ternary operator in REPL

[bkamins]

Here is a similar issue to #28506 but with ternary operator.

When x ? y : z is used in scripts it can be split into two lines e.g. like this:

1 == 2 ?
println(3) : println(4)

or like this

1 == 2 ?
println(3) :
println(4)

However, in REPL it is an error (even if actually there is a space after ? or : before a newline), e.g.:

julia> 1 == 2 ?
ERROR: syntax: space required after "?" operator

julia> 1 == 2 ? # I have added a space after ?
ERROR: syntax: space required after "?" operator

julia> 1 == 2 ? 3 :
ERROR: syntax: space required after colon in "?" expression

[bkamins]

I just checked it in 0.7.0-rc2 and it accepted newlines in the REPL without a warning.