fix(dav): avoid TypeError on public DAV HEAD range

Signed-off-by: hgrobbel <[email protected]>

Author: hubimuc

sabre/dav/lib/DAV/CorePlugin.php

@@ -83,15 +83,15 @@ public function httpGet(RequestInterface $request, ResponseInterface $response)
             $body = '';
         } else {
             $body = $node->get();
-
-            // Converting string into stream, if needed.
-            if (is_string($body)) {
-                $stream = fopen('php://temp', 'r+');
-                fwrite($stream, $body);
-                rewind($stream);
-                $body = $stream;
-            }
         }
+        // Converting string into stream, if needed.
+        if (is_string($body)) {
+            $stream = fopen('php://temp', 'r+');
+            fwrite($stream, $body);
+            rewind($stream);
+            $body = $stream;
+        }
+    
 
         /*
          * TODO: getetag, getlastmodified, getsize should also be used using