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MUC: Fix nickname registration form error handling (fixes #1930) `dataform:data()` always returns the first table of collected values, even if there are errors, so checking for its absence did not detect when a required field (the only field, nickname) was missing.

For full information on our dependencies, version requirements, and
where to find them, see https://prosody.im/doc/depends

If you have luarocks available on your platform, install the following:

  - luaexpat
  - luasocket
  - luafilesystem
  - luasec