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The live reduction should check if there is sufficient count in the incoming data chunk before starting (similar to auto reduction).
This will help the live reduction to avoid the following error:

`ValueError: Invalid value for property Params (dbl list) from string "33340.8,0,33340.8": When setting value of property "Params": Cannot have a zero bin width`

Here is one example case: https://monitor.sns.gov/report/ref_m/39525/

The measurement of the incident beam should not go through live reduction, which is safeguarded by a PV.
However, users, especially new ones, could forget to update the PV field during experiment, which results in the following error during processing:

`must be real number, not NoneType`

Here is one example case: https://monitor.sns.gov/report/ref_m/39493/

We need more meaningful error message from the reduction package so that the user is aware that they should check their experiment settings before moving onto the next measurement.

The code does not work at all for python3 as the python introspection library has changed. Unfortunately, the blog post referenced in the code is now private and can no longer be read.