This fixes a series of issues:
* The JS implementation had a trim() in one place that was
missing in PHP.
* The actual parameter name in the paramNames/$params array was
trimmed, but the "normalized" name (this is only for duplicate
detection) was not trimmed.
* It was possible for an empty parameter to show up.
This resulted in very strange behavior, e.g. {{{ 1}}}{{{1 }}}
was detected as "1" and "10" (?), i.e. it would try to renumber
the duplicate in a strange way (string "1" plus a counter that
starts with 0).
Change-Id: I0a6371f3633b03b5b21809ecd06ea4c72d7d914d
