Merge pull request #1497 from software-security-systems/st-poco-1.7.7-fixed-add-content-to-message-in-parts-handler

* Net: fixed adding content part to mail message with empty content-d…

Net/src/MailMessage.cpp

@@ -119,6 +119,13 @@ namespace
 					
 					pPS->headers().set(it->first, it->second);
 				}
+
+				if (contentDisp.empty())
+				{
+					_pMsg->addContent(pPS, cte);
+					added = true;
+				}
+
 				if (!added) delete pPS;
 			}
 		}