HackStudio: Only refresh Git widget on save if initialized

Author: https://github.com/itamar8910
Commit: b82a254da0
Pull-request: https://github.com/SerenityOS/serenity/pull/3534
Reviewed-by: https://github.com/awesomekling

DevTools/HackStudio/Git/GitWidget.h

@@ -43,10 +43,13 @@ public:
 
     void refresh();
     void set_view_diff_callback(ViewDiffCallback callback);
+    bool initialized() const { return !m_git_repo.is_null(); };
 
 private:
     explicit GitWidget(const LexicalPath& repo_root);
 
+    bool initialize();
+    bool initialize_if_needed();
     void stage_file(const LexicalPath&);
     void unstage_file(const LexicalPath&);
     void commit();