Handle nodes without coordinates #143
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Treat nodes without coordinates the same as if they are absent, in construct_multipolygon, construct_multilinestring, and when processing ways, to avoid producing coordinates of NaN/null. When a segment of a relation (either a line string, or a polygon ring) consists entirely of invalid nodes, omit this empty array, to avoid producing a coordinates element which is an empty array. Both of these changes will cause such features to be omitted from the output when they have no coordinates, just as they already are for ways which reference nodes that are absent, and relations which reference ways that are absent.
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When a node has no coordinates, treat it as missing for the purpose of constructing the multilinestring, multipolygon, or way geometry, to avoid producing coordinates of [NaN, NaN].
When a piece of a multipolygon or multilinestring contains no coordinates, remove it, to avoid inserting an empty array into the coordinates array.
Fixes #142