while trying out the embedded web-server, choosing the fonttest will
fail and cause the server to crash


$ mtxrun --script server --auto
mtx-server      | running at port: 8088
mtx-server      | document root:
/home/vm/data/context/tex/texmf-context/scripts/context/lua
mtx-server      | main index file: unknown
mtx-server      | scripts subpath:
/home/vm/data/context/tex/texmf-context/scripts/context/lua
mtx-server      | context services:
http://localhost:8088/mtx-server-ctx-startup.lua
mtx-server      | request from: 127.0.0.1
mtx-server      | request data: GET /mtx-server-ctx-startup.lua HTTP/1.1
mtx-server      | requested url: /mtx-server-ctx-startup.lua
mtx-server      | requested action: /mtx-server-ctx-startup.lua
mtx-server      | performing action: /mtx-server-ctx-startup.lua
mtx-server      | locating script:
/home/vm/data/context/tex/texmf-context/scripts/context/lua/mtx-server-ctx-startup.lua
mtx-server      | loading script:
/home/vm/data/context/tex/texmf-context/scripts/context/lua/mtx-server-ctx-startup.lua
mtx-server      | return type: function
mtx-server      | saving script: function
mtx-server      | running script:
/home/vm/data/context/tex/texmf-context/scripts/context/lua/mtx-server-ctx-startup.lua
mtx-server      | request from: 127.0.0.1
mtx-server      | request data: GET /favicon.ico HTTP/1.1
mtx-server      | requested url: /favicon.ico
mtx-server      | requested action: /favicon.ico
mtx-server      | performing action: /favicon.ico
mtx-server      | requested file: /favicon.ico
mtx-server      | unknown file: /favicon.ico
mtx-server      | handling error 404: Not Found
mtx-server      | request from: 127.0.0.1
mtx-server      | request data: GET /mtx-server-ctx-fonttest.lua HTTP/1.1
mtx-server      | requested url: /mtx-server-ctx-fonttest.lua
mtx-server      | requested action: /mtx-server-ctx-fonttest.lua
mtx-server      | performing action: /mtx-server-ctx-fonttest.lua
mtx-server      | locating script:
/home/vm/data/context/tex/texmf-context/scripts/context/lua/mtx-server-ctx-fonttest.lua
mtx-server      | loading script:
/home/vm/data/context/tex/texmf-context/scripts/context/lua/mtx-server-ctx-fonttest.lua
mtx-server      | return type: function
lua error :
...ext/tex/texmf-context/tex/context/base/mkiv/font-hsh.lua:12: attempt
to index a nil value (global 'font')