Attempting to export a PDF with blank routes throws an error

[jmccollum-woolpert]

Attempting to export a PDF for a route with no shipments and no start or end location throws an unhelpful error to the user. Variations of the following can appear depending on the exact issue:

Error generating report
Li.path.map is not a function

Expectation:

• Empty routes should either be filtered out of export completely or properly supported with a blank table and map
• A more helpful error message for the user should be provided if there's an error during export.