[Tile-serving] [openstreetmap/osm2pgsql] segfault in middle_pgsql_t::local_nodes_set (#564)

[Paul Norman]

If it's hitting pgsql.cpp:130 then it's in the `if(PQresultStatus(res) != expect)` logic and in the process of throwing an error. 

The actual code is `message += paramValues[i];` where `message` is a `std::string` and `paramValues` is a `const char *const *`

Prior to the line, message is `insert_node failed: ERROR:  duplicate key value violates unique constraint \"planet_osm_nodes_pkey\"\nDETAIL:  Key (id)=(2554008024) already exists.\n(7)\n`

printing off what it's trying to append, the issue is that one of the params is null

```
(gdb) print paramValues[0]
$8 = 0x7fffffffd830 "2554008024"
(gdb) print paramValues[1]
$9 = 0x7fffffffd83b "603106530"
(gdb) print paramValues[2]
$10 = 0x7fffffffd845 "85998169"
(gdb) print paramValues[3]
$11 = 0x0
```

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