Added ability to view orders paid with removed payment method without breaking

.phpstan.baseline.neon

@@ -3865,11 +3865,6 @@ parameters:
 			count: 1
 			path: app/code/core/Mage/Sales/Model/Order/Payment.php
 
-		-
-			message: "#^Property Mage_Sales_Model_Order_Payment\\:\\:\\$_canVoidLookup \\(string\\) does not accept bool\\.$#"
-			count: 2
-			path: app/code/core/Mage/Sales/Model/Order/Payment.php
-
 		-
 			message: "#^Method Mage_Sales_Model_Order_Payment_Transaction\\:\\:getOrderId\\(\\) should return int\\|null but return statement is missing\\.$#"
 			count: 1

app/code/core/Mage/Adminhtml/Block/Sales/Items/Abstract.php

@@ -449,8 +449,11 @@ public function canEditQty()
         ) {
             return false;
         }
-        if ($this->getOrder()->getPayment()->canCapture()) {
-            return $this->getOrder()->getPayment()->canCapturePartial();
+        if (($payment = $this->getOrder()->getPayment())
+            && Mage::helper('payment')->getMethodModelClassName($payment->getMethod()) !== null
+            && $payment->canCapture()
+        ) {
+            return $payment->canCapturePartial();
         }
         return true;
     }

app/code/core/Mage/Adminhtml/Block/Sales/Order/View.php

@@ -162,7 +162,7 @@ public function __construct()
 
         if ($this->_isAllowedAction('creditmemo') && $order->canCreditmemo()) {
             $onClick = Mage::helper('core/js')->getSetLocationJs($this->getCreditmemoUrl());
-            if ($order->getPayment()->getMethodInstance()->isGateway()) {
+            if ($order->getPayment() && $order->getPayment()->getMethodInstance()->isGateway()) {
                 $onClick = Mage::helper('core/js')->getConfirmSetLocationJs(
                     $this->getCreditmemoUrl(),
                     Mage::helper('sales')->__('This will create an offline refund. To create an online refund, open an invoice and create credit memo for it. Do you wish to proceed?')

app/code/core/Mage/Payment/Helper/Data.php

@@ -120,9 +120,20 @@ public function getMethodFormBlock(Mage_Payment_Model_Method_Abstract $method)
      *
      * @return  Mage_Core_Block_Template|Mage_Core_Block_Abstract
      */
-    public function getInfoBlock(Mage_Payment_Model_Info $info)
+    public function getInfoBlock(Mage_Payment_Model_Info|false $info)
     {
-        $blockType = $info->getMethodInstance()->getInfoBlockType();
+        $method = $info !== false ? $info->getMethod() : $this->__('No Data Found');
+        if ($this->getMethodModelClassName($method) !== null) {
+            $blockType = $info->getMethodInstance()->getInfoBlockType();
+        } else {
+            Mage::log(
+                sprintf('Payment method was not found: %s', $method),
+                Zend_Log::NOTICE
+            );
+            return ($this->getLayout() ?? Mage::app()->getLayout())
+                ->createBlock('core/text')
+                ->setText($method);
+        }
         if ($this->getLayout()) {
             $block = $this->getLayout()->createBlock($blockType);
         } else {

app/code/core/Mage/Sales/Model/Order.php

@@ -671,6 +671,9 @@ public function canCancel()
      */
     public function canVoidPayment()
     {
+        if ($this->getPayment() === false) {
+            return false;
+        }
         return $this->_canVoidOrder() ? $this->getPayment()->canVoid($this->getPayment()) : false;
     }
 
@@ -841,7 +844,10 @@ public function canEdit()
             return false;
         }
 
-        if (!$this->getPayment()->getMethodInstance()->canEdit()) {
+        if (!($payment = $this->getPayment())
+            || Mage::helper('payment')->getMethodModelClassName($payment->getMethod()) === null
+            || !$payment->getMethodInstance()->canEdit()
+        ) {
             return false;
         }
 

app/code/core/Mage/Sales/Model/Order/Payment.php

@@ -221,7 +221,7 @@ class Mage_Sales_Model_Order_Payment extends Mage_Payment_Model_Info
 
     /**
      * Whether can void
-     * @var string
+     * @var bool|null
      */
     protected $_canVoidLookup = null;
 
@@ -650,6 +650,10 @@ protected function _invoice()
     public function canVoid(Varien_Object $document)
     {
         if ($this->_canVoidLookup === null) {
+            if (Mage::helper('payment')->getMethodModelClassName($this->getMethod()) === null) {
+                $this->_canVoidLookup = false;
+                return $this->_canVoidLookup;
+            }
             $this->_canVoidLookup = (bool)$this->getMethodInstance()->canVoid($document);
             if ($this->_canVoidLookup) {
                 $authTransaction = $this->getAuthorizationTransaction();