Fix wrong Content-Length on AsyncResponseStream: always return "null" and apply proper test in SapiEmitter.

Author: cdujeu

core/src/core/src/pydio/Core/Http/Middleware/SapiMiddleware.php

@@ -130,8 +130,14 @@ public function emitResponse(ServerRequestInterface $request, ResponseInterface
                 $response = $response->withHeader("Content-type", "text/xml; charset=UTF-8");
             }
         }
+        if($response === false){
+            return;
+        }
 
-        if($response !== false && ($response->getBody()->getSize() || $response instanceof \Zend\Diactoros\Response\EmptyResponse) || $response->getStatusCode() != 200) {
+        if( $response->getBody()->getSize() === null
+            || $response->getBody()->getSize() > 0
+            || $response instanceof \Zend\Diactoros\Response\EmptyResponse
+            || $response->getStatusCode() != 200) {
             $emitter = new SapiEmitter();
             ShutdownScheduler::setCloseHeaders($response);
             $emitter->emit($response);

core/src/core/src/pydio/Core/Http/Response/AsyncResponseStream.php

@@ -100,7 +100,7 @@ public function detach()
     public function getSize()
     {
         // Return a non-null size if there's a pending callback.
-        return (isSet($this->callback) && !$this->callbackExecuted ? 1 : null);
+        return null;//(isSet($this->callback) && !$this->callbackExecuted ? 1 : null);
     }
 
     /**