We had the fix in the renderer, but we do use pQuery also in further processing of the rendered email
e.g. in code where we add GA tracking params to links.
In this commit, I moved the fix directly to the pQuery library so that it is safe to use
later in email code processing.
[MAILPOET-6190]
In case there were new lines on the CSS string, the parser threw
a warning on an empty line with \n. The original check $kv === ''
didn't catch " \n".
Applying trim to a CSS rule should be safe
because whitespace at the end or beginning of a rule is meaningless.
[MAILPOET-5540]
