util: fix find_missing_translations error when missing sections
util: fix find_missing_translations error when missing sections

It should be ok to not have a replaceText or a replaceSync section
without throwing an error.  This fixes it.

quisquous/cactbot,quisquous/cactbot,quisquous/cactbot,quisquous/cactbot,quisquous/cactbot,quisquous/cactbot