[toolbox-optimizer] Fix crash if <template> is the very last element
#1372
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Fixes
TypeError: Cannot read properties of null (reading 'firstChild')if a<template>was the last element.Existing tests didn't catch this since
<template>was followed by some whitespace. However, when we manually advance thenode, we need to check the enter condition of the loop again sincenextNodedoes not accept a nullable node.