Cannot run observables from non-indexed TensorProducts with ProgramSets

[sesmart]

Describe the bug

device.run(Circuit().h(0).h(1).expectation(Z() @ Z(), target=[0,1])).result() works fine. However,

device.run(ProgramSet.zip(circuits = [Circuit().h(0).h(1)], observables= [Z() @ Z()]), shots = 1000).result() fails.

Non-indexed TensorProducts lead to some sort of errors in programs.inputs where there is incorrectly a None object.

To reproduce

See above snippets. Uses LocalSimulator.

Alternatively:

"device.run(ProgramSet(
CircuitBinding(
circuit=Circuit().h(0).h(1),
observables= [Z() @ Z()]
), shots_per_executable=100)).result()
"

Expected behavior

TensorProducts without indices should be able to run okay.

Screenshots or logs

251 return ParameterSets(program.inputs)
252 num_observables = len(observables)
253 return ParameterSets({
254 k: v[::num_observables]
--> 255 for k, v in program.inputs.items()
256 if not k.startswith(EULER_OBSERVABLE_PREFIX)
257 })

AttributeError: 'NoneType' object has no attribute 'items'

System information
A description of your system. Please provide:

• Amazon Braket Python SDK version: 1.103.0
• Amazon Braket Python Schemas version: 1.26.1
• Amazon Braket Python Default Simulator version: 1.32.0
• Python version: 3.12.10

Additional context
Add any other context about the problem here.

[speller26]

Definitely needs a clearer message; there's also the possibility of having implicit targets when the number of qubits in the observable matches that of the circuit.