Add Twenty::Project#path_exist?

server/lib/twenty/server/model/project.rb

@@ -15,6 +15,13 @@ class Twenty::Project < Sequel::Model
     super&.sub(Dir.home, "~")
   end
 
+  ##
+  # @return [Boolean]
+  #  Returns true when {#path} exists on disk.
+  def path_exist?
+    File.exist? File.expand_path(path)
+  end
+
   ##
   # @return [Integer]
   #  Returns the number of open tasks a project has.