fix(config_compiler): null value should not overwrite a normal key in a merged tree
fix(config_compiler): null value should not overwrite a normal key in a merged tree

kionz/librime,kionz/librime,Prcuvu/librime,rime/librime,Prcuvu/librime,rime/librime,rime/librime,Prcuvu/librime,Prcuvu/librime,kionz/librime,rime/librime,Prcuvu/librime,kionz/librime