Fix a NULL pointer dereference in the 'add user' page of webadmin

This was just recently introduced in rev 935 "Display user's vhost if it's
not in the global vhost list".

Thanks to icu and Kuja for reporting.


git-svn-id: https://znc.svn.sourceforge.net/svnroot/znc/trunk@937 726aef4b-f618-498e-8847-2d620e286838

modules/webadmin.cpp

@@ -872,7 +872,7 @@ bool CWebAdminSock::UserPage(CString& sPageRet, CUser* pUser) {
 			}
 
 			// If our current vhost is not in the global list...
-			if (!bFoundVHost && !pUser->GetVHost().empty()) {
+			if (pUser && !bFoundVHost && !pUser->GetVHost().empty()) {
 				CTemplate& l = m_Template.AddRow("VHostLoop");
 
 				l["VHost"] = pUser->GetVHost();