fix(flagd): handle "None" target value correctly

Author: AdityaVallabh

providers/openfeature-provider-flagd/src/openfeature/contrib/provider/flagd/resolvers/in_process.py

@@ -121,8 +121,6 @@ def _resolve(
             )
 
         variant, value = flag.get_variant(variant)
-        if value is None:
-            raise ParseError(f"Resolved variant {variant} not in variants config.")
 
         return FlagResolutionDetails(
             value,

providers/openfeature-provider-flagd/src/openfeature/contrib/provider/flagd/resolvers/process/flags.py

@@ -92,4 +92,7 @@ def get_variant(
         if isinstance(variant_key, bool):
             variant_key = str(variant_key).lower()
 
+        if variant_key not in self.variants:
+            raise ParseError(f"Resolved variant {variant_key} not in variants config.")
+
         return variant_key, self.variants.get(variant_key)

providers/openfeature-provider-flagd/tests/test_in_process.py

@@ -143,6 +143,11 @@ def test_resolve_boolean_details_invalid_variant(resolver, flag):
             context("target_variant"), "resolve_object_details", {},
             "TARGETING_MATCH", "target_variant", {},
         ),
+        (
+            {"default_variant": None, "target_variant": None}, targeting(),
+            context("target_variant"), "resolve_object_details", {},
+            "TARGETING_MATCH", "target_variant", None,
+        ),
     ],
     ids=[
         "static_flag",
@@ -153,6 +158,7 @@ def test_resolve_boolean_details_invalid_variant(resolver, flag):
         "boolean_falsy_target",
         "integer_falsy_target",
         "object_falsy_target",
+        "none_target_value",
     ],
 )
 def test_resolver_details(