From be8de684be79aed756c4347f5459ee1765967710 Mon Sep 17 00:00:00 2001
From: David Fairbrother <DavidFair@users.noreply.github.com>
Date: Mon, 8 May 2017 16:04:19 +0100
Subject: [PATCH] Re #19500 Fix None being appended as a string to the ext

---
 scripts/Diffraction/isis_powder/routines/run_details.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/Diffraction/isis_powder/routines/run_details.py b/scripts/Diffraction/isis_powder/routines/run_details.py
index efe8bdf0dcf..a694713bc9d 100644
--- a/scripts/Diffraction/isis_powder/routines/run_details.py
+++ b/scripts/Diffraction/isis_powder/routines/run_details.py
@@ -41,7 +41,7 @@ def create_run_details_object(run_number_string, inst_settings, is_vanadium_run,
         output_run_string = run_number_string
 
     # Get the file extension if set
-    file_extension = getattr(inst_settings, "file_extension" )
+    file_extension = getattr(inst_settings, "file_extension")
     if file_extension:
         # Prefix dot if user has forgotten to
         file_extension = file_extension if file_extension.startswith('.') else '.' + file_extension
@@ -183,6 +183,6 @@ class _RunDetails(object):
         self.vanadium_run_numbers = vanadium_run_number
 
         # Optional
-        self.file_extension = str(file_extension)
+        self.file_extension = str(file_extension) if file_extension else None
         self.sample_empty = sample_empty
         self.vanadium_absorption_path = vanadium_abs_path
-- 
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