No newline after Flags in usage

The flags usage template from pflags has a trailing \n. We need to
include a newline in case there are no flags in our template. This will
trim the newline from the end of the flags from pflag and we can do it
right outselves.

cobra.go

@@ -23,10 +23,12 @@ import (
 	"strconv"
 	"strings"
 	"text/template"
+	"unicode"
 )
 
 var templateFuncs template.FuncMap = template.FuncMap{
 	"trim":           strings.TrimSpace,
+	"trimRightSpace": trimRightSpace,
 	"rpad":           rpad,
 	"gt":             Gt,
 	"eq":             Eq,
@@ -113,6 +115,10 @@ func Eq(a interface{}, b interface{}) bool {
 	return false
 }
 
+func trimRightSpace(s string) string {
+	return strings.TrimRightFunc(s, unicode.IsSpace)
+}
+
 //rpad adds padding to the right of a string
 func rpad(s string, padding int) string {
 	template := fmt.Sprintf("%%-%ds", padding)

command.go

@@ -186,6 +186,9 @@ func (c *Command) UsageFunc() (f func(*Command) error) {
 	} else {
 		return func(c *Command) error {
 			err := tmpl(c.Out(), c.UsageTemplate(), c)
+			if err != nil {
+				fmt.Print(err)
+			}
 			return err
 		}
 	}
@@ -263,10 +266,10 @@ Available Commands:{{range .Commands}}{{if .IsAvailableCommand}}
   {{rpad .Name .NamePadding }} {{.Short}}{{end}}{{end}}{{end}}{{ if .HasLocalFlags}}
 
 Flags:
-{{.LocalFlags.FlagUsages}}{{end}}{{ if .HasInheritedFlags}}
+{{.LocalFlags.FlagUsages | trimRightSpace}}{{end}}{{ if .HasInheritedFlags}}
 
 Global Flags:
-{{.InheritedFlags.FlagUsages}}{{end}}{{if .HasHelpSubCommands}}
+{{.InheritedFlags.FlagUsages | trimRightSpace}}{{end}}{{if .HasHelpSubCommands}}
 
 Additional help topics:{{range .Commands}}{{if .IsHelpCommand}}
   {{rpad .CommandPath .CommandPathPadding}} {{.Short}}{{end}}{{end}}{{end}}{{ if .HasSubCommands }}