CASMTRIAGE-6176: Fix error when filtering for architecture on an empt…

…y node list
Cray-HPE · Oct 18, 2023 · 43f2a0a · 43f2a0a
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 - Make the include_disabled option work as intended.
 - Return the correct object from hsm's get_components call when there are no nodes in the session.
+- Fixed session setup errors when there are no valid nodes before filtering for architecture.
 
 ## [2.9.0] - 09-29-2023
 ### Changed

diff --git a/src/bos/operators/session_setup.py b/src/bos/operators/session_setup.py
@@ -181,6 +181,8 @@ def _apply_arch(self, nodes, arch):
         returns:
           A set representing the subset of nodes that match arch, or the logical arch from HSM.
         """
+        if not nodes:
+            return nodes
         valid_archs = set([arch])
         if arch == 'X86':
             valid_archs.add('UNKNOWN')