fix error handling in XSD types - finally overrides prior returns

linkml_runtime/utils/metamodelcore.py

@@ -229,15 +229,16 @@ def __new__(cls, value: Union[str, datetime.time, datetime.datetime, Literal]) -
             raise ValueError(f"{value} is not a valid time")
         if isinstance(value, Literal):
             value = value.value
+
         try:
             if not isinstance(value, datetime.time):
                 value = datetime.time.fromisoformat(value)
             return datetime.time.fromisoformat(str(value)).isoformat()
         except (TypeError, ValueError):
             if is_strict():
                 raise
-        finally:
-            return str(value)
+
+        return str(value)
 
     @classmethod
     def is_valid(cls, value: Union[str, datetime.time, datetime.datetime, Literal]) -> bool:
@@ -260,15 +261,16 @@ def __new__(cls, value: Union[str, datetime.date, Literal]) -> str:
             raise ValueError(f"{value} is not a valid date")
         if isinstance(value, Literal):
             value = value.value
+
         try:
             if not isinstance(value, datetime.date):
                 value = datetime.date.fromisoformat(str(value))
             return value.isoformat()
         except (TypeError, ValueError):
             if is_strict():
                 raise
-        finally:
-            return str(value)
+
+        return str(value)
 
     @classmethod
     def is_valid(cls, value: Union[str, datetime.date, Literal]) -> bool:
@@ -293,15 +295,16 @@ def __new__(cls, value: Union[str, datetime.datetime, Literal]) -> str:
             raise ValueError(f"{value} is not a valid datetime")
         if isinstance(value, Literal):
             value = value.value
+
         try:
             if not isinstance(value, datetime.datetime):
                 value = datetime.datetime.fromisoformat(value)  # Note that this handles non 'T' format as well
             return value.isoformat()
         except (TypeError, ValueError):
             if is_strict():
                 raise
-        finally:
-            return str(value)
+
+        return str(value)
 
     @classmethod
     def is_valid(cls, value: Union[str, datetime.datetime, Literal]) -> bool: