buildAggregateColumn needs to handle error code

In ha_calpont_execplan.cpp in function buildAggregateColumn around line 3608, there is this code:
else

{ rc = buildReturnedColumn(ord_col, gwi, gwi.fatalParseError); }

It needs to check the return code rc and the fatalParseError flag:

else
{
rc = buildReturnedColumn(ord_col, gwi, gwi.fatalParseError);
if (!rc || gwi.fatalParseError)

{ return NULL; }

}