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Cannot compile DropTable and CreateTable queries

See original GitHub issue

Hello!

I try to create table via this code:

import asyncio

from asyncpgsa import pg
import sqlalchemy as sa
from sqlalchemy.sql.ddl import CreateTable, DropTable

users = sa.Table(
    'users', sa.MetaData(),
    sa.Column('id', sa.Integer, primary_key=True),
    sa.Column('name', sa.VARCHAR(255)),
)


async def main():
    await pg.init('postgresql://localhost/test')
    await pg.query(DropTable(users))
    await pg.query(CreateTable(users))


loop = asyncio.get_event_loop()
loop.run_until_complete(main())

and got an error from asyncpgsa

Traceback (most recent call last):
  File "/project/main.py", line 20, in <module>
    loop.run_until_complete(main())
  File "/project/.venv/python3.6/asyncio/base_events.py", line 467, in run_until_complete
    return future.result()
  File "/project/main.py", line 15, in main
    await pg.query(DropTable(users))
  File "/project/.venv/lib/python3.6/site-packages/asyncpgsa/pgsingleton.py", line 65, in query
    compiled_q, compiled_args = compile_query(query)
  File "/project/.venv/lib/python3.6/site-packages/asyncpgsa/connection.py", line 60, in compile_query
    compiled_params = sorted(compiled.params.items())
AttributeError: 'NoneType' object has no attribute 'items'

Same code using sqlalchemy works fine:

import sqlalchemy as sa
from sqlalchemy.sql.ddl import CreateTable, DropTable

users = sa.Table(
    'users', sa.MetaData(),
    sa.Column('id', sa.Integer, primary_key=True),
    sa.Column('name', sa.VARCHAR(255)),
)

engine = sa.create_engine('postgresql://localhost/test')
engine.execute(DropTable(users))
engine.execute(CreateTable(users))

Thanks!