From cb1f4ebd44336bd22b829de00b078f416db1e46e Mon Sep 17 00:00:00 2001
From: guerler <aysam.guerler@gmail.com>
Date: Sat, 3 Jun 2023 16:45:10 +0200
Subject: [PATCH] Tool warnings can be either None or a dictionary but not a
 string

---
 lib/galaxy/tools/__init__.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/galaxy/tools/__init__.py b/lib/galaxy/tools/__init__.py
index 957dcf4fbba..a8ccec0b37a 100644
--- a/lib/galaxy/tools/__init__.py
+++ b/lib/galaxy/tools/__init__.py
@@ -2430,7 +2430,7 @@ class Tool(Dictifiable):
 
         # load job parameters into incoming
         tool_message = ""
-        tool_warnings = ""
+        tool_warnings = None
         if job:
             try:
                 job_params = job.get_param_values(self.app, ignore_errors=True)