enhance: new confirm empty commit dialog (#1143)

Signed-off-by: leo <longshuang@msn.cn>

src/ViewModels/ConfirmEmptyCommit.cs

@@ -0,0 +1,31 @@
+using System;
+
+namespace SourceGit.ViewModels
+{
+    public class ConfirmEmptyCommit
+    {
+        public bool HasLocalChanges
+        {
+            get;
+            private set;
+        }
+
+        public ConfirmEmptyCommit(bool hasLocalChanges, Action<bool> onSure)
+        {
+            HasLocalChanges = hasLocalChanges;
+            _onSure = onSure;
+        }
+
+        public void StageAllThenCommit()
+        {
+            _onSure?.Invoke(true);
+        }
+
+        public void Continue()
+        {
+            _onSure?.Invoke(false);
+        }
+
+        private Action<bool> _onSure;
+    }
+}