Libs: KiCad: Fileformat: Fix missing defaults (#94)

Fix missing defaults

src/faebryk/libs/kicad/fileformats.py

@@ -583,15 +583,15 @@ class C_property:
         at: C_xyr
         layer: C_text_layer
         hide: bool = False
-        uuid: UUID
+        uuid: UUID = field(default_factory=gen_uuid)
         effects: C_effects
 
     @dataclass
     class C_footprint_polygon(C_polygon):
         stroke: C_stroke
         fill: E_fill
         layer: str
-        uuid: UUID
+        uuid: UUID = field(default_factory=gen_uuid)
 
     @dataclass(kw_only=True)
     class C_pad:
@@ -1168,7 +1168,7 @@ class C_footprint_in_file(C_footprint):
         tags: Optional[list[str]] = None
         version: int = field(**sexp_field(assert_value=20240108), default=20240108)
         generator: str
-        generator_version: str
+        generator_version: str = ""
         tedit: Optional[str] = None
 
     footprint: C_footprint_in_file