changed default behaviour of .json when it received an empty value (n…

…ow returns the default class)

osbot_utils/helpers/sqlite/Sqlite__Table__Create.py

@@ -17,8 +17,8 @@ def __init__(self, table_name):
         self.set_default_fields()
 
     def add_field(self, field_data: dict):
-        sqlite_field = Sqlite__Field.from_json(field_data)
-        if sqlite_field:
+        if field_data and isinstance(field_data, dict):
+            sqlite_field = Sqlite__Field.from_json(field_data)
             self.fields.append(sqlite_field)
             return True
         return False

osbot_utils/type_safe/Type_Safe.py

@@ -432,7 +432,7 @@ def from_json(cls, json_data, raise_on_not_found=False):
             json_data = json_parse(json_data)
         if json_data:                                           # if there is no data or is {} then don't create an object (since this could be caused by bad data being provided)
             return cls().deserialize_from_dict(json_data,raise_on_not_found=raise_on_not_found)
-        return None
+        return cls()
 
 # todo: see if it is possible to add recursive protection to this logic
 def serialize_to_dict(obj):

tests/unit/helpers/sqlite/test_Sqlite__Field.py

@@ -115,7 +115,7 @@ def assert_sqlite_field_type(field_name, field_type, expected_type_local):
             sqlite_field = Sqlite__Field.from_json(field_data)
             assert sqlite_field.__locals__() == expected_data
 
-        assert Sqlite__Field.from_json({}) is None
+        assert Sqlite__Field.from_json({}).obj() == Sqlite__Field().obj()
 
         assert_sqlite_field_type('id'    , int  , Sqlite__Field__Type.INTEGER)
         assert_sqlite_field_type('aaaa' , float, Sqlite__Field__Type.REAL    )