fix: Show proper error message for prepared report failure (#24733) (#…

…24737)

(cherry picked from commit 12bbfd2)

Co-authored-by: Ankush Menat <ankush@frappe.io>

frappe/desk/query_report.py

@@ -291,9 +291,9 @@ def get_report_data(doc, data):
 		try:
 			if data := json.loads(doc.get_prepared_data().decode("utf-8")):
 				report_data = get_report_data(doc, data)
-		except Exception:
+		except Exception as e:
 			doc.log_error("Prepared report render failed")
-			frappe.msgprint(_("Prepared report render failed"))
+			frappe.msgprint(_("Prepared report render failed") + f": {str(e)}")
 			doc = None
 
 	return report_data | {"prepared_report": True, "doc": doc}