From c717b3ed028a5a838efe5b412e2940e5da4ee77f Mon Sep 17 00:00:00 2001
From: John Chilton <jmchilton@gmail.com>
Date: Wed, 8 Jan 2025 13:46:21 -0500
Subject: [PATCH] Fix for empty string in regex validator message.

xref https://github.com/galaxyproject/galaxy/issues/19386
---
 lib/galaxy/tool_util/parser/parameter_validators.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/galaxy/tool_util/parser/parameter_validators.py b/lib/galaxy/tool_util/parser/parameter_validators.py
index 29af9494b0bd..f850e0acce85 100644
--- a/lib/galaxy/tool_util/parser/parameter_validators.py
+++ b/lib/galaxy/tool_util/parser/parameter_validators.py
@@ -668,9 +668,9 @@ def raise_error_if_valiation_fails(
         raise AssertionError("Validator logic problem - computed validation value must be boolean")
     if message is None:
         message = validator.message
-    if message is None:
+    if not message:
         message = DEFAULT_VALIDATOR_MESSAGE
-    assert message
+    assert message is not None
     if value_to_show and "%s" in message:
         message = message % value_to_show
     negate = validator.negate