* Add migration function for 20220821

Das_Schwarze_Auge_4-1/dsa4_1_character_sheet_roll20.html

@@ -18061,6 +18061,7 @@ Relevant character sheet versions
 * 20211010: Clearer attribute names for life energy, astral energy etc.
 * 20220116: New roll buttons
 * 20220604: Visibili Vanitar spelling fixes
+* 20220821: Sheet Initialization
 */
 function migrationCheck() {
     safeGetAttrs(["character_sheet_version", "data_version", "sheet_initialized"], function(v) {
@@ -18159,7 +18160,8 @@ var versionsWithMigrations = [
     20210718,
     20211010,
     20220116,
-    20220604
+    20220604,
+    20220821
 ];
 
 function initializeSheet(migrationChain) {
@@ -18908,6 +18910,20 @@ function migrateTo20220604(migrationChain) {
 	});
 }
 
+/*
+	Migration steps:
+	- Initialize attribute "sheet_initialized"
+*/
+function migrateTo20220821(migrationChain) {
+	var caller = "migrateTo20220821";
+	debugLog(caller, "Invoked.");
+
+	var attrsToChange = { "sheet_initialized": true };
+	safeSetAttrs(attrsToChange, {}, function(){
+		callNextMigration(migrationChain);
+	});
+}
+
 on("sheet:opened", function() {
     migrationCheck();
     safeSetAttrs({ "safe-sheet-open": Date.now() });