Metadata.visualize with path parameter throws AttributeError

[xamm]

Environment Details

Please indicate the following details about the environment in which you found the bug:

• SDV version: 0.12.1
• Python version: 3.8.12
• Operating System: macOS

Error Description

When calling metadata.visualize() with a path specified an AttributeError is thrown.

Steps to reproduce

from sdv import load_demo
metadata, tables = load_demo(metadata=True)
metadata.visualize("./test.png")

Analysis

This occurs due to calling graphviz.backend.FORMATS instead of graphviz.FORMATS in Line 16 in visualization.py

As described in xflr6/graphviz#149 .backend should not be used.

Fix

change
if graphviz_extension not in graphviz.backend.FORMATS:

to
if graphviz_extension not in graphviz.FORMATS: