fixed: KETCHER-487 (File with Rgroup member cannot be opened in other structure editors)
fixed: KETCHER-487 (File with Rgroup member cannot be opened in other structure editors)

ggasoftware/ketcher,ggasoftware/ketcher,ggasoftware/ketcher,ggasoftware/ketcher,ggasoftware/ketcher,ggasoftware/ketcher