From d8bb4999dc4a0a3f016b7121f9a8a447846910fa Mon Sep 17 00:00:00 2001
From: l_samenv <l_samenv@samenv.psi.ch>
Date: Tue, 12 Dec 2023 10:46:55 +0100
Subject: [PATCH] better error message when instance is missing

---
 __init__.py | 2 +-
 base.py     | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/__init__.py b/__init__.py
index cd847cc..4f64add 100644
--- a/__init__.py
+++ b/__init__.py
@@ -93,7 +93,7 @@ def run(group, arglist):
             args.setdefault('action', 'gui')
             print('do you mean:\n   %s %s %s %s %s' %
                   (group, args.get('action', ''), args.get('ins', ''), args.get('service', ''), ' '.join(extra)))
-        else:            
+        else:
             try:
                 serv.action(args['action'], *serv.treat_args(args, extra + arglist))
             except AttributeError:
diff --git a/base.py b/base.py
index e7da651..50243f6 100644
--- a/base.py
+++ b/base.py
@@ -281,6 +281,8 @@ class ServiceManager:
         if ins not in self.env:
             self.get_info()
         gr = self.group.upper()
+        if not ins:
+            raise UsageError('need instance')
         env = self.env[ins]
         return env.get('%s_ROOT' % gr, ''), env