__init__.py Accesses Catalog dict Improperly

[mdkallick]

When the default init.py uses the catalog dict, it accesses it using "catalog.key" rather than "catalog.get('key')". This is not proper python code and will not run.
Examples:
line 54: "for stream in catalog.streams:"
line 55: "stream_metadata = metadata.to_map(stream.metadata)"