mod_compat_roles: Fix attempt to index a nil value #1847 permissions[] is not a map with role names as keys since 817bc9873fc2 but instead a level with host names were added. This was likely an oversight. Refactored towards railroad.

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This module writes out a traceback to `traceback.txt` in Prosodys data

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directory (see `prosodyctl about`) when the signal `SIGUSR1` is

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received. This is useful when debugging seemingly frozen instances in

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case it is stuck in Lua code.