minor code fix: remove duplicate type check branch (#22536)

api/core/variables/types.py

@@ -91,8 +91,6 @@ class SegmentType(StrEnum):
             return SegmentType.OBJECT
         elif isinstance(value, File):
             return SegmentType.FILE
-        elif isinstance(value, str):
-            return SegmentType.STRING
         else:
             return None
 

api/core/workflow/entities/variable_pool.py

@@ -152,7 +152,6 @@ class VariablePool(BaseModel):
             self.variable_dictionary[selector[0]] = {}
             return
         key, hash_key = self._selector_to_keys(selector)
-        hash_key = hash(tuple(selector[1:]))
         self.variable_dictionary[key].pop(hash_key, None)
 
     def convert_template(self, template: str, /):