[FeatureRequest] More descriptive error message when function is bound to non-existing storage

[shwars]

This is more a suggestion for improvement than feature request...

When Python Azure function has data binding to non-existing blob storage, the following error message is displayed, which I believe is not very descriptive. I think an error message indicating the non-existing Azure resource would be much easier to understand to the users.

[08.07.2020 10:13:27] System.Private.CoreLib: Exception while executing function: Functions.covidata. System.Private.CoreLib: Result: Failure
Exception: AttributeError: 'NoneType' object has no attribute 'type'
Stack:   File "C:\Users\dmitryso\AppData\Roaming\npm\node_modules\azure-functions-core-tools\bin\workers\python\3.7/WINDOWS/X64\azure_functions_worker\dispatcher.py", line 317, in _handle__invocation_request
    pytype=pb_type_info.pytype)
  File "C:\Users\dmitryso\AppData\Roaming\npm\node_modules\azure-functions-core-tools\bin\workers\python\3.7/WINDOWS/X64\azure_functions_worker\bindings\meta.py", line 72, in from_incoming_proto
    return binding.decode(datum, trigger_metadata=metadata)
  File "C:\Users\dmitryso\AppData\Roaming\npm\node_modules\azure-functions-core-tools\bin\workers\python\3.7/WINDOWS/X64\azure\functions\blob.py", line 78, in decode
    data_type = data.type

[Hazhzeng]

Thanks @shwars for raising the issue,

We made a change in the azure-functions library to return None when the blob does not exist as this is more intuitive.
Azure/azure-functions-python-library#67

We're currently waiting for the next deployment, I will close this issue once it is fully released.
Thanks again.

[Hazhzeng]

This feature is rolled-out and as I'm closing this issue. Please let me know if you face this again.