Return stream when body is empty

Author: sagikazarmark

src/StreamFactory/DiactorosStreamFactory.php

@@ -24,10 +24,12 @@ public function createStream($body = null)
             } else {
                 $stream = new Stream('php://memory', 'rw');
 
-                if (null !== $body || '' !== $body) {
-                    $stream->write((string) $body);
+                if (null === $body || '' === $body) {
+                    return $stream;
                 }
 
+                $stream->write((string) $body);
+
                 $body = $stream;
             }
         }

src/StreamFactory/SlimStreamFactory.php

@@ -28,9 +28,11 @@ public function createStream($body = null)
             $resource = fopen('php://memory', 'r+');
             $stream = new Stream($resource);
 
-            if (null !== $body || '' !== $body) {
-                $stream->write((string) $body);
+            if (null === $body || '' === $body) {
+                return $stream;
             }
+
+            $stream->write((string) $body);
         }
 
         $stream->rewind();