Remove unused function

Author: carolynvs

manifest.go

@@ -5,11 +5,10 @@
 package dep
 
 import (
+	"bytes"
 	"io"
 	"sort"
 
-	"bytes"
-
 	"github.com/golang/dep/gps"
 	"github.com/pelletier/go-toml"
 	"github.com/pkg/errors"
@@ -140,14 +139,6 @@ func (m *Manifest) toRaw() rawManifest {
 	return raw
 }
 
-// IsEmpty - Checks if payload is empty
-func (m *Manifest) IsEmpty() bool {
-	if len(m.Ovr) == 0 && len(m.Ignored) == 0 && len(m.Dependencies) == 0 && len(m.Required) == 0 {
-		return true
-	}
-	return false
-}
-
 type sortedRawProjects []rawProject
 
 func (s sortedRawProjects) Len() int      { return len(s) }