Update app.py

[codelion]

When the default yaml file has no values, it would make inputs, None this will default to empty dict in that case.

[patched-admin]

This code change involves assigning a default empty dictionary to the variable inputs if the yaml.safe_load() function is unable to load any data from the specified config or patchwork config file. This ensures that inputs will always have a value, even if the file reading operation fails.

---

• File changed: patchwork/app.py
  In this code change, a default empty dictionary {} is assigned to the variable inputs if the yaml.safe_load() function fails to load any data from the specified config or patchwork config file. This ensures that inputs always has a value even if the file reading operation is unsuccessful.

[CTY-git]

LGTM