From c75b2030b9c040c07c507f47822257879399e85d Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Wed, 21 Feb 2024 11:13:19 +0100
Subject: Julia: RefList: Return nothing if no reflections in list

---
 julia/CrystFEL/src/reflists.jl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/julia/CrystFEL/src/reflists.jl b/julia/CrystFEL/src/reflists.jl
index 901162e8..d922bdae 100644
--- a/julia/CrystFEL/src/reflists.jl
+++ b/julia/CrystFEL/src/reflists.jl
@@ -55,7 +55,7 @@ function Base.iterate(reflist::RefList{T}) where T
                  reflist.internalptr, rli)
 
     if refl == C_NULL
-        throw(ArgumentError("Failed to find first reflection in list"))
+        return nothing   # no reflections!
     end
 
     iter = RefListIterator(refl,rli[])
-- 
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