fix(vhd-lib/VhdSynthetic#readHeaderAndFooter()): root vhd can be a dynamic and check chaining
fix(vhd-lib/VhdSynthetic#readHeaderAndFooter()): root vhd can be a dynamic and check chaining

lmcro/xo-web,vatesfr/xo-web,lmcro/xo-web,lmcro/xo-web,vatesfr/xo-web