Existing EBDs without table should be renderable as SVG

[OLILHR]

Example:

This EBD, however, still (a) does exist and (b) contains metadata. There are approx. 30 of these EBDs for each FV. It would be neat if rebdhuhn could generate SVGs that contain the metadata, including the new remark key with the value "Derzeit ist für diese Entscheidung kein Entscheidungsbaum notwendig, da keine Antwort gegeben wird."

Since the EBD frontend fetches its content from *.svg files, corresponding "empty" EBDs are currently mussing.

[OLILHR]

also, these "empty" EBDs tend to copy the content of the subsequent EBD,
example: E_0621.svg shows the graph of E_0624; but E_0624.svg still exists and shows the correct graph.