From e03c14fa4f230e92ebc6c139b1e5046efd1fff86 Mon Sep 17 00:00:00 2001
From: John Truckenbrodt <john.truckenbrodt@posteo.de>
Date: Tue, 9 Apr 2024 10:46:02 +0200
Subject: [PATCH] [ancillary.multicore] improved error message

---
 spatialist/ancillary.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/spatialist/ancillary.py b/spatialist/ancillary.py
index 8aa39a4..5f5336c 100644
--- a/spatialist/ancillary.py
+++ b/spatialist/ancillary.py
@@ -323,6 +323,8 @@ def multicore(function, cores, multiargs, pbar=False, **singleargs):
     arglengths = list(set([len(multiargs[x]) for x in multiargs]))
     if len(arglengths) > 1:
         raise AttributeError('multi argument lists of different length')
+    if arglengths[0] == 0:
+        raise RuntimeError('did not get any multiargs')
     
     # prevent starting more threads than necessary
     cores = cores if arglengths[0] >= cores else arglengths[0]