Fix for ALFCOM-2882 - only set response content type for a command if it has not already been applied.

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@14778 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/web/app/servlet/CommandServlet.java

@@ -181,7 +181,10 @@ public class CommandServlet extends BaseServlet
             if (logger.isDebugEnabled())
                logger.debug("No return page specified, displaying status output.");
             
+            if (res.getContentType() == null)
+            {
                res.setContentType("text/html");
+            }
             
             // request that the processor output a useful status message
             PrintWriter out = res.getWriter();