Check for the short_name parameter being None in Schema.get_type_by_s…

…hort_name.

cl/runtime/schema/schema.py

@@ -29,6 +29,7 @@
 from memoization import cached
 from typing_extensions import Self
 from cl.runtime.primitive.case_util import CaseUtil
+from cl.runtime.primitive.string_util import StringUtil
 from cl.runtime.records.class_info import ClassInfo
 from cl.runtime.records.protocols import KeyProtocol
 from cl.runtime.schema.type_decl import TypeDecl
@@ -71,6 +72,8 @@ def add_types_to_dict_by_short_name(cls, types: Iterable[Type]) -> None:
     @classmethod
     def get_type_by_short_name(cls, short_name: str) -> Type:
         """Get type from short name (class name with optional package alias)."""
+        if StringUtil.is_empty(short_name):
+            raise RuntimeError("Empty short name is passed to Schema.get_type_by_short_name.")
 
         # Get dictionary of types indexed by alias
         type_dict_by_short_name = cls.get_type_dict()