Still continue on pattern build failure/List failed patterns

[tburny]

I am using Pattern Lab Node v2.7.2 on Linux, with Node v4.7.X, using the Grunt Edition.

Expected Behavior

When a pattern fails to build, it is listed as "failed" in the console output after writing the output.
Even when a pattern fails we still can build the rest and show an error message instead of the failed template.

Actual Behavior

No output is written if the engine throws an exception during rendering.

Steps to Reproduce

Fail a template build e.g. using invalid JSON.

[stale]

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