Minor fixups around non existent files for timestamps

internal/pkg/util/util.go

@@ -12,7 +12,7 @@ import (
 )
 
 
-func DirModTime (path string) time.Time {
+func DirModTime (path string) (time.Time, error) {
 
     var lastTime time.Time
     err := filepath.Walk(path, func(path string, info os.FileInfo, err error) error {
@@ -28,9 +28,9 @@ func DirModTime (path string) time.Time {
         return nil
     })
     if err != nil {
-        return time.Now()
+        return time.Time{}, err
     }
-    return lastTime
+    return lastTime, nil
 }
 
 func RandomString(n int) string {