meta_query doesnt support "empty" values

[dd32]

Basically, a meta_value of '0' is ignored in meta queries, It bases it on empty(), so a meta value being "empty" is ignored.

This mainly comes into play for numeric comparisons, ie. field >= 0 (do not want -50 etc)

Code: Line 423 change from empty() to strlen()?

Core includes a hack to work around this already

of course it was reported 4 months ago.. #15292

Not quite the same thing, but I'll run with it.

I meant to post this comment on #16735.