politeiavoter: Log errors in two unlogged error paths

main() does not have a catch-all log for errors returned by _main(), so it is
the responsibility of _main() to print or log these for every error return.

politeiawww/cmd/politeiavoter/politeiavoter.go

@@ -1695,6 +1695,8 @@ func _main() error {
  // Contact WWW
  c, err := firstContact(shutdownCtx, cfg)
  if err != nil {
+ err := fmt.Errorf("Network error: %v\n", err)
+ fmt.Fprintln(os.Stderr, err)
  return err
  }
  // Close GRPC
@@ -1707,6 +1709,8 @@ func _main() error {
  // block height to validate GPRC creds.
  ar, err := c.wallet.Accounts(c.ctx, &pb.AccountsRequest{})
  if err != nil {
+ err := fmt.Errorf("Error pulling wallet accounts: %v\n", err)
+ fmt.Fprintln(os.Stderr, err)
  return err
  }
  log.Debugf("Current wallet height: %v", ar.CurrentBlockHeight)