【内嵌支付】修复“paddle支付邮编为空也可以购买”

PDF Office/PDF Master/Class/Purchase/DMG/KMPurchaseEmbeddedWindowController.swift

@@ -910,7 +910,7 @@ class KMPurchaseEmbeddedWindowController: NSWindowController {
             return
         }
         if paymentMethod == .paddle {
-            if !isNumeric(paddleTextField.stringValue) {
+            if !isNumeric(paddleTextField.stringValue) && paddleTextField.stringValue != "" {
                 let alert = NSAlert()
                 alert.alertStyle = .critical
                 alert.messageText = NSLocalizedString("Connection Error", comment: "")