Fix coverage gaps

Author: nkrishnaswami

openapi_python_client/parser/openapi.py

@@ -200,7 +200,7 @@ def _add_responses(
 
             # No reasons to use lazy imports in endpoints, so add lazy imports to relative here.
             for media_type in response.content:
-                if not media_type.prop:
+                if not media_type.prop:  # pragma: no cover
                     continue
                 endpoint.relative_imports |= media_type.prop.get_lazy_imports(prefix=models_relative_prefix)
                 endpoint.relative_imports |= media_type.prop.get_imports(prefix=models_relative_prefix)

openapi_python_client/parser/properties/protocol.py

@@ -66,10 +66,6 @@ class PropertyProtocol(Protocol):
     def type_string(self) -> str:
         return self.get_type_string()
 
-    @property
-    def instance_type_string(self) -> str:
-        return self.get_instance_type_string()
-
     @abstractmethod
     def convert_value(self, value: Any) -> Value | None | PropertyError:
         """Convert a string value to a Value object"""