bindings: Add validation for enum Sequence or Array

Source/bindings/scripts/idl_types.py

Index: Source/bindings/scripts/idl_types.py
diff --git a/Source/bindings/scripts/idl_types.py b/Source/bindings/scripts/idl_types.py
index e75123c55dc9bd7089e8dd0d0fab709267254d71..20038d341d9954859c45530c57863afb8d3efe06 100644
--- a/Source/bindings/scripts/idl_types.py
+++ b/Source/bindings/scripts/idl_types.py
@@ -180,7 +180,7 @@ class IdlType(IdlTypeBase):
 
     @property
     def enum_values(self):
-        return IdlType.enums[self.name]
+        return IdlType.enums.get(self.name)
 
     @property
     def is_integer_type(self):
@@ -345,6 +345,10 @@ class IdlArrayOrSequenceType(IdlTypeBase):
     def is_array_or_sequence_type(self):
         return True
 
+    @property
+    def enum_values(self):
+        return self.element_type.enum_values
+
 
 class IdlArrayType(IdlArrayOrSequenceType):
     def __init__(self, element_type):