Fix crash with keybase --standalone log send (#10628)

This makes it work again, albeit without UI logs.

go/chat/tlf.go

@@ -1,6 +1,7 @@
 package chat
 
 import (
+	"errors"
 	"fmt"
 	"time"
 
@@ -34,7 +35,7 @@ func NewKBFSNameInfoSource(g *globals.Context) *KBFSNameInfoSource {
 
 func (t *KBFSNameInfoSource) tlfKeysClient() (*keybase1.TlfKeysClient, error) {
 	if t.G().ConnectionManager == nil {
-		return nil, fmt.Errorf("no connection manager available")
+		return nil, errors.New("no connection manager available")
 	}
 	xp := t.G().ConnectionManager.LookupByClientType(keybase1.ClientType_KBFS)
 	if xp == nil {

go/client/cmd_log_send.go

@@ -124,9 +124,12 @@ func (c *CmdLogSend) pokeUI() error {
 		return err
 	}
 	err = cli.PrepareLogsend(context.Background())
+	if err != nil {
+		return err
+	}
 	// Give the GUI a moment to get its logs in order
 	time.Sleep(1 * time.Second)
-	return err
+	return nil
 }
 
 func (c *CmdLogSend) confirm() error {

go/service/git.go

@@ -4,6 +4,7 @@
 package service
 
 import (
+	"errors"
 	"fmt"
 	"time"
 
@@ -340,7 +341,7 @@ func (h *GitHandler) kbfsClient() (*keybase1.KBFSGitClient, error) {
 		return nil, libkb.LoginRequiredError{}
 	}
 	if h.G().ConnectionManager == nil {
-		return nil, fmt.Errorf("no connection manager available")
+		return nil, errors.New("no connection manager available")
 	}
 	xp := h.G().ConnectionManager.LookupByClientType(keybase1.ClientType_KBFS)
 	if xp == nil {

go/service/logsend.go

@@ -5,11 +5,12 @@ package service
 
 import (
 	"errors"
+	"time"
+
 	"github.com/keybase/client/go/libkb"
 	keybase1 "github.com/keybase/client/go/protocol/keybase1"
 	"github.com/keybase/go-framed-msgpack-rpc/rpc"
 	"golang.org/x/net/context"
-	"time"
 )
 
 type LogsendHandler struct {
@@ -25,7 +26,11 @@ func NewLogsendHandler(xp rpc.Transporter, g *libkb.GlobalContext) *LogsendHandl
 }
 
 func (h *LogsendHandler) PrepareLogsend(ctx context.Context) error {
-	xp := h.G().ConnectionManager.LookupByClientType(keybase1.ClientType_GUI_MAIN)
+	connMgr := h.G().ConnectionManager
+	if connMgr == nil {
+		return errors.New("no connection manager available")
+	}
+	xp := connMgr.LookupByClientType(keybase1.ClientType_GUI_MAIN)
 	if xp == nil {
 		return errors.New("GUI main process wasn't found")
 	}