[Tile-serving] [openstreetmap/osm2pgsql] Flex output is trying to create ID index on tables without IDs (#1507)

[rouen-sk]

Huh, I did not think of it that way, I somehow assumed way tables (with way ID) must have unique ways in them, etc. But that is not the case clearly. 

I will try that. 

Meanwhile, I have patched my local version to disable ID index creation and deleting (as part of re-processing) for tables without ID columns - I have added `&& table.table().has_id_column()`

to https://github.com/openstreetmap/osm2pgsql/blob/f23e6ab522646ff47a6a786d8870d54e7b9c904a/src/output-flex.cpp#L1725
and
https://github.com/openstreetmap/osm2pgsql/blob/f23e6ab522646ff47a6a786d8870d54e7b9c904a/src/output-flex.cpp#L1500

And it works :) 
Your solution is probably the correct one for my use case, but my patch is probably still needed for scenarios where you really need  tables without IDs. 

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