The transfer screen should show an error to the user if it occurs in the process

[agatsoh]

Thanks for filing a bug report :-)

Steps to Reproduce

1. make a mediated transfer
2. Press continue on the transfer screen here
   

Expected Result

• Screen should show an error which happens on user action and take him out

Actual Result

• The spinner keeps spinning without showing any error to the user.
  
  

Additional Infos (Optional)

- Browser & version
Chrome Version 83.0.4103.97 (Official Build) (64-bit)
- Browser console errors
Screenshots are given above
`type: "path/find/failure", payload: RaidenError: Pathfinding Service is disabled and no direct route is available.`
- Device / OS
Linux mint

raiden_2020-06-09T11_10_08.828Z.log

[andrevmatos]

This is not an error. That PFS "failure" action/log is actually just the response to the direct route check, which happens before the actual PFS request. Your issue is actually that the PFS was disabled from VUE_APP_PFS env var missing from my guide and actually being passed as undefined and that disabled the PFS fetching, which made the transfer gets stuck waiting for a PFS to show up.
My PR will fix that by also supporting undefined as pfs auto mode. In the meantime, you can just export VUE_APP_PFS="" on the terminal before serving the dApp, and this will enable PFS again, as expected.