Merge branch 'nullfix' of github.com:jamieburchell/omnipay-sagepay into jamieburchell-opayo-urls

Author: judgej

src/Message/ServerAuthorizeRequest.php

@@ -38,7 +38,7 @@ public function getData()
 
         // Set the profile only if it is LOW (for iframe use) or NORMAL (for full-page redirects)
 
-        $profile = strtoupper($this->getProfile());
+        $profile = strtoupper($this->getProfile() ?? '');
 
         if ($profile === static::PROFILE_NORMAL || $profile === static::PROFILE_LOW) {
             $data['Profile'] = $this->getProfile();

src/Message/ServerCompleteAuthorizeRequest.php

@@ -65,7 +65,7 @@ public function getData()
     {
         // The two signatures to compare.
         $signature = $this->getSignature();
-        $VPSSignature = strtolower($this->httpRequest->request->get('VPSSignature'));
+        $VPSSignature = strtolower($this->httpRequest->request->get('VPSSignature') ?? '');
 
         if ($VPSSignature !== $signature) {
             throw new InvalidResponseException;

src/Traits/ServerNotifyTrait.php

@@ -18,7 +18,7 @@ trait ServerNotifyTrait
      */
     public function getSignature()
     {
-        return strtolower($this->getDataItem('VPSSignature'));
+        return strtolower($this->getDataItem('VPSSignature') ?? '');
     }
 
     /**
@@ -56,7 +56,7 @@ public function buildSignature()
             $this->getTransactionId(),
             $this->getStatus(),
             $this->getTxAuthNo(),
-            strtolower($this->getVendor()),
+            strtolower($this->getVendor() ?? ''),
             $this->getAVSCV2(),
             ($this->getTxType() === Response::TXTYPE_TOKEN ? $this->getToken() : ''),
             // As saved in the merchant application.