[Tile-serving] [openstreetmap/osm2pgsql] Lua function errors now trigger runtime exception (#845)

[mmd]

As seen on https://help.openstreetmap.org/questions/64259/osm2pgsql-failed-due-to-error-failed-to-execute-lua-function:

@SomeoneElseOSM seems to be the first one to hit this stricter check: the previous z_order calculation logic had some issue ("attempt to perform arithmetic on field 'layer' (a string value)")  and the error message on osm2pgsql was easy to ignore. With the stricter check, the error message is no longer ignored, and the stylesheet needs to be fixed to use proper Lua syntax.
 
Code in question: https://github.com/SomeoneElseOSM/SomeoneElse-style/blob/master/style.lua#L16

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