don't clone unsaved file buffers.

if I open multiple empty tabs, I don't want the same "new file buffers"

cmd/micro/buffer.go

@@ -55,10 +55,12 @@ type SerializedBuffer struct {
 
 // NewBuffer creates a new buffer from `txt` with path and name `path`
 func NewBuffer(txt []byte, path string) *Buffer {
-	for _, tab := range tabs {
-		for _, view := range tab.views {
-			if view.Buf.Path == path {
-				return view.Buf
+	if path != "" {
+		for _, tab := range tabs {
+			for _, view := range tab.views {
+				if view.Buf.Path == path {
+					return view.Buf
+				}
 			}
 		}
 	}