Graphical Model 3: Using a Result

[Jammy2211]

The following example compares a run using analysis summing and graph:

https://github.com/Jammy2211/autolens_workspace_test/blob/main/model_graph/task_3_result.py

You can run it fast by using the export PYAUTOFIT_TEST_MODE=1 environment variable.

This tries to use the result returned by the fit.

For analysis summing, it can be used:

    positions_likelihood = source_lp_result[0].positions_likelihood_from(
        factor=3.0, minimum_threshold=0.2
    )

For graphical models, it raises this error:

Traceback (most recent call last):
  File "/mnt/c/Users/Jammy/Code/PyAuto/autolens_workspace_test/model_graph/task_3_result.py", line 300, in <module>
    fit()
  File "/mnt/c/Users/Jammy/Code/PyAuto/autolens_workspace_test/model_graph/task_3_result.py", line 294, in fit
    positions_likelihood = source_lp_result[0].positions_likelihood_from(
  File "/mnt/c/Users/Jammy/Code/PyAuto/PyAutoFit/autofit/non_linear/result.py", line 355, in __getitem__
    return self.child_results[item]
TypeError: 'NoneType' object is not subscriptable

Again, hopefully an easy fix.