o comment blocks filled arrays disappear
o empty array tags disappear
o empty value tags collapse

This only leaves comment blocks in empty tags, which create
whitespace noise, which fucks up the config.xml real bad,
rippling through to the code that deal with is_array, isset
and actual = array() assignments to fix the faulty config.
Will clean this up one by one later.

(cherry picked from commit ed59098b)
(cherry picked from commit 20d24274)