Empty Webkit Mask Crash

third_party/blink/web_tests/fast/css/empty-webkit-mask-crash.html

150.0.7829.2203 B

https://bugs.webkit.org/show\_bug.cgi?id=50151 : Crash in LayoutBox::paintMaskImages due to a mask without an associated image
The test passes if it does not CRASH (normally the output is a white page)