Fixed coding style

Author: aimeos

src/Omnipay/Common/AbstractGateway.php

@@ -139,7 +139,7 @@ public function getParameter($key)
      */
     public function setParameter($key, $value)
     {
-        if($value !== null && !is_scalar($value)) {
+        if ($value !== null && !is_scalar($value)) {
             throw new RuntimeException('Only scalar values are allowed for parameters');
         }
 

src/Omnipay/Common/Message/AbstractRequest.php

@@ -170,7 +170,7 @@ protected function setParameter($key, $value)
             throw new RuntimeException('Request cannot be modified after it has been sent!');
         }
 
-        if($value !== null && !is_scalar($value)) {
+        if (null !== $value && !is_scalar($value)) {
             throw new RuntimeException('Only scalar values are allowed for parameters');
         }