GeoJSON reader: fix crashes (in debug mode) on invalid GeoJSON #498
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json::operator[] is advertised as having undefined behavior when the request member doesn't exist or the json item is not an object. json::at() is similar but emits a C++ exception on those situations. Fixes libgeos#1138
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json::operator[] is advertised as having undefined behavior when the
request member doesn't exist or the json item is not an object.
json::at() is similar but emits a C++ exception on those situations.
Fixes #1138