fixed the treatment of a response that contains only one run

slic/core/acquisition/sfacquisition.py

@@ -1,6 +1,6 @@
 import os
 from time import sleep
-from collections import defaultdict
+from collections import defaultdict, Iterable
 
 from slic.utils.channels import Channels
 from slic.utils.printing import printable_dict
@@ -72,8 +72,11 @@ class SFAcquisition(BaseAcquisition):
         paths = SwissFELPaths(self.instrument, self.pgroup)
 
         def _acquire():
-            res = client.start_continuous() if continuous else client.start()
-            res = transpose_dicts(res) #TODO: only for continuous?
+            if continuous:
+                res = client.start_continuous()
+                res = transpose_dicts(res)
+            else:
+                res = client.start()
             filenames = res.pop("filenames")
             print_response(res)
             return filenames
@@ -126,7 +129,7 @@ def print_response(res):
     to_print = {}
     for k, v in res.items():
         k = k.replace("_", " ")
-        if len(set(v)) == 1:
+        if isinstance(v, Iterable) and len(set(v)) == 1: #TODO: maybe the Iterable check should not be here, but in transpose_dicts?
             v = v[0]
         else:
             k = k if k.endswith("s") else k+"s"