`std::bad_alloc()` when header table is empty

[olii]

There is a bug when the AMQP header table has a nested table that is empty (0 entries). The exception std::bad_alloc() is thrown.

This is the line:

SimpleAmqpClient/src/TableImpl.cpp

Lines 353 to 354 in 6369b99

	case AMQP_FIELD_KIND_TABLE:
	new_value.value.table = CopyTableInner(value.value.table, pool);

Then this is called and it throws the exception:

SimpleAmqpClient/src/TableImpl.cpp

Lines 306 to 314 in 6369b99

	amqp_table_t TableValueImpl::CopyTableInner(const amqp_table_t &table,
	amqp_pool_t &pool) {
	amqp_table_t new_table;
	new_table.num_entries = table.num_entries;
	new_table.entries = (amqp_table_entry_t *)amqp_pool_alloc(
	&pool, sizeof(amqp_table_entry_t) * table.num_entries);
	if (NULL == new_table.entries) {
	throw std::bad_alloc();

I experience this by trying to consume the celery v5.3.1 event.

The stamps is a table that has no entries.