Uncaught exception when trying to load templates

[jleach]

When the wallet 1.0.16+ is unable to load the proof template bundles Axios fails and throws an exception which is not handled properly:

 WARN  Possible Unhandled Promise Rejection (id: 1):
[AxiosError: Request failed with status code 404]
 WARN  Possible Unhandled Promise Rejection (id: 2):
[AxiosError: Request failed with status code 404]
 WARN  Possible Unhandled Promise Rejection (id: 3):
[AxiosError: Request failed with status code 404]

This should correctly be caught and logged for better debugging.