Resolved Key Summary is not displayed in the end summary

Summary

widget.py class LogLine() has a print_summary() that is called at the end of an app initialised bst stream command. This should generate a Resolved Key Summary section, which shows the output of show_pipeline() (in the same way show output from bst show). Currently this is not being triggered, however as can been in the source when grepping, it was in the output of bst build for the docs for 1.1

Steps to reproduce

bst build an example project, there is no Resolved Key Summary before the Pipeline Summary

What is the current bug behavior?

No Resolved Key Summary is rendered

What is the expected correct behavior?

It was once rendered, but the sorted list comprehension to enter the function is returning None.

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