Fail silently when we can't find template labels
Fail silently when we can't find template labels

While debugging problems with duplicating scenarios, I discovered that
throwing exceptions while rendering templates is less than helpful.

Since having missing labels isn't really exceptional, and the
application can continue to function fine without them, I think it's
better to provide a default value and print a warning instead.

project-icp/bee-pollinator-app,WikiWatershed/model-my-watershed,project-icp/bee-pollinator-app,kdeloach/model-my-watershed,kdeloach/model-my-watershed,kdeloach/model-my-watershed,kdeloach/model-my-watershed,WikiWatershed/model-my-watershed,lliss/model-my-watershed,WikiWatershed/model-my-watershed,lliss/model-my-watershed,project-icp/bee-pollinator-app,lliss/model-my-watershed,WikiWatershed/model-my-watershed,WikiWatershed/model-my-watershed,lliss/model-my-watershed,lliss/model-my-watershed,kdeloach/model-my-watershed,project-icp/bee-pollinator-app