Clear child table before appending (#14648)

diff --git a/erpnext/hr/doctype/appraisal/appraisal.js b/erpnext/hr/doctype/appraisal/appraisal.js
index 64d6f40..30317d9 100644
--- a/erpnext/hr/doctype/appraisal/appraisal.js
+++ b/erpnext/hr/doctype/appraisal/appraisal.js
@@ -24,6 +24,7 @@
 }
 
 cur_frm.cscript.kra_template = function(doc, dt, dn) {
+	doc.goals = [];
 	erpnext.utils.map_current_doc({
 		method: "erpnext.hr.doctype.appraisal.appraisal.fetch_appraisal_template",
 		source_name: cur_frm.doc.kra_template,