
gr-diff-builder should not try to re-render an element that does not exist. Context: When the lines specified in https://gerrit.googlesource.com/gerrit/+/master/polygerrit-ui/app/samples/coverage-plugin.html#32 is not yet visible on the page it throws a JS error in the console. Bug: https://bugs.chromium.org/p/skia/issues/detail?id=7081 Change-Id: Ia5051c8df2ef4a1c4f4f9b09f6aec68b4fd69fdf