v.io/jiri/profiles/commandline: --rm-all should error out if there are no profiles installed.

Change-Id: Iee11518e700a9e0203d095191be8c439efc52d97
diff --git a/profiles/commandline/driver.go b/profiles/commandline/driver.go
index 171e1f1..f653346 100644
--- a/profiles/commandline/driver.go
+++ b/profiles/commandline/driver.go
@@ -12,6 +12,7 @@
 	"bytes"
 	"flag"
 	"fmt"
+	"os"
 	"path/filepath"
 	"strings"
 	"text/template"
@@ -534,10 +535,10 @@
 }
 
 func runRmAll(ctx *tool.Context) error {
-	if err := ctx.Run().Remove(manifestFlag); err != nil {
+	if err := ctx.Run().Remove(manifestFlag); err != nil && !os.IsNotExist(err) {
 		return err
 	}
-	if err := ctx.Run().RemoveAll(rootPath.Expand()); err != nil {
+	if err := ctx.Run().RemoveAll(rootPath.Expand()); err != nil && !os.IsNotExist(err) {
 		return err
 	}
 	return nil