Temporary change to allow gen3 fringes to work.

lsst · Oct 29, 2019 · 35b92f1 · 35b92f1
1 parent ee19f03
commit 35b92f1
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/python/lsst/pipe/base/connections.py b/python/lsst/pipe/base/connections.py
@@ -54,7 +54,7 @@ class ScalarError(TypeError):
     """
     def __init__(self, key, numDataIds):
         super().__init__((f"Expected scalar for output dataset field {key}, "
-                          "received {numDataIds} DataIds"))
+                          f"received {numDataIds} DataIds"))
 
 
 class PipelineTaskConnectionDict(UserDict):
@@ -424,8 +424,10 @@ def buildDatasetRefs(self, quantum: Quantum) -> typing.Tuple[InputQuantizedConne
                     # Unpack arguments that are not marked multiples (list of
                     # length one)
                     if not attribute.multiple:
-                        if len(quantumInputRefs) != 1:
+                        if len(quantumInputRefs) > 1:
                             raise ScalarError(attributeName, len(quantumInputRefs))
+                        if len(quantumInputRefs) == 0:
+                            continue
                         quantumInputRefs = quantumInputRefs[0]
                     # Add to the QuantizedConnection identifier
                     setattr(refs, attributeName, quantumInputRefs)