Update TryConvertTensorToBroadcastScalar to exit early if constExpTen… (#18495)
Update TryConvertTensorToBroadcastScalar to fail gracefully if not CPU
tensor
### Description
Added early exit for in TryConvertTensorToBroadcastScalar if there is no
CpuData to prevent failure caused by constExpTensor->GetByteData()
throwing.
### Motivation and Context
DmlPrototype branch was failing in QLinearConv when there was no CpuData
---------
Co-authored-by: Christian Larson <28911437+chrilaMSFT@users.noreply.github.com>