rfix: raise error if wrong key_name

src/cal_tools/tools.py

@@ -127,10 +127,14 @@ def map_modules_from_folder(
     sequences_qm = {}
     for inset in karabo_da:
         module_idx = int(inset[-2:])
+
         if key_name == "qm":
             name = module_index_to_qm(module_idx)
-        else:
+        elif key_name == "da":
             name = inset  # karabo_da
+        else:
+            raise ValueError("key_name must be 'da' or 'qm'")
+
         module_files[name] = Queue()
         sequences_qm[name] = 0
         mod_ids[name] = module_idx