Deal with nonpositivefilter component = undefined (When it's deleted)
Deal with nonpositivefilter component = undefined (When it's deleted)

cc: da39a3ee5e6b4b0d3255bfef95601890afd80709@domoritz

vega/vega-lite,vega/vega-lite,vega/vega-lite,uwdata/vega-lite,vega/vega-lite,uwdata/vega-lite,uwdata/vega-lite,vega/vega-lite,uwdata/vega-lite,uwdata/vega-lite