Money values of '0' give an assertion error in decimal formats

[Venorcis]

money/src/Formatter/IntlMoneyFormatter.php

Line 61 in df7234f

assert(! empty($formatted));

I believe this empty check is incorrect, because it will trigger an AssertionError on the string '0', which could be a perfectly fine result (e.g. in Polish decimal localisation). I'd suggest removing these assertions altogether; they occur in multiple formatters!

[UlrichEckhardt]

PHP at its finest again:

php > var_dump(empty('0'));
bool(true)

Should that be assert($formatted !== ''); instead?