BuildStream is not reporting element-path in the startup summary

In the case that example.bst actually exists under element-path, it is unclear from the output that a specific element-path was used as it is not reported in the summary.

In the case that example.bst doesn't exist under element-path, no partially parsed pipeline is printed at all (e.g. the configuration of element-path). This then results in

# bst build example.bst
[--:--:--][][] START   Build
[--:--:--][][] START   Loading pipeline
[00:00:00][][] FAILURE Loading pipeline

Error loading pipeline: Could not find file at /src/elements/example.bst

It is not clear were 'elements' above came from.