{Core} Remove double definition of 'is_guid'

Author: VoxSecundus

src/azure-cli-core/azure/cli/core/util.py

@@ -1235,9 +1235,15 @@ def is_guid(guid):
     try:
         uuid.UUID(guid)
         return True
-    except ValueError:
+    except (ValueError, TypeError):
         return False
 
+def assert_guid(guid, name=None):
+    if not is_guid(guid):
+        if name:
+            raise CLIError("{} must be a GUID.".format(name))
+        raise CLIError("{} is not a GUID.".format(guid))
+
 
 def handle_version_update():
     """Clean up information in local files that may be invalidated
@@ -1353,17 +1359,3 @@ def should_encrypt_token_cache(cli_ctx):
     encrypt = cli_ctx.config.getboolean('core', 'encrypt_token_cache', fallback=fallback)
 
     return encrypt
-
-def is_guid(guid):
-    import uuid
-    try:
-        uuid.UUID(guid)
-        return True
-    except (ValueError, TypeError):
-        return False
-
-def assert_guid(guid, name=None):
-    if not is_guid(guid):
-        if name:
-            raise CLIError("{} must be a GUID.".format(name))
-        raise CLIError("{} is not a GUID.".format(guid))