fix(serialization): set exclude_unset to False by default

If set to True it means that any non-null default values created through omission will not be
serialized into JSON/YAML. This is problematic if we are using default values that can be manually
overriden but don't need to be specified explicitely most of the time.

queenbee/schema/qutil.py

@@ -17,14 +17,14 @@ def _keep_name_order_in_yaml():
 class BaseModel(PydanticBaseModel):
     """BaseModel with functionality to return the object as a yaml string."""
 
-    def yaml(self, exclude_unset=True):
+    def yaml(self, exclude_unset=False):
         return yaml.dump(
             self.dict(exclude_unset=exclude_unset),
             default_flow_style=False
         )
 
     def to_dict(self):
-        return self.dict(exclude_unset=True)
+        return self.dict(exclude_unset=False)
 
     def to_json(self, filepath, indent=None):
         """Write workflow to a JSON file.
@@ -38,7 +38,7 @@ def to_json(self, filepath, indent=None):
 
     def to_yaml(self, filepath):
         """Write workflow to a yaml file."""
-        content = self.yaml(exclude_unset=True)
+        content = self.yaml(exclude_unset=False)
 
         with open(filepath, 'w') as out_file:
             out_file.write('# This file is generated by queenbee\n')