[Tile-serving] [openstreetmap/osm2pgsql] Return error when Lua tag transform cannot be read (#842)

[Paul Norman]

> I haven't really looked much into the test cases yet. Do we already have tests covering errors during tag processing, like "Tag transform style does not contain a function filter_tags_node"?

Currently we're not really handling any errors with missing lua functions, be it a missing file, or a missing function within the file. We should be, but we want to make sure that new code has corresponding tests in the test suite.

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