Add an emptiness check with error message to WebAssembly function parser for ref.call.
Pull request: https://github.com/WebKit/WebKit/pull/3555
Committed 253757@main (c827e066953d): <https://commits.webkit.org/253757@main> Reviewed commits have been landed. Closing PR #3555 and removing active labels.
<rdar://problem/98380955>