Get authentication credentials before the first WEBDAV transaction.

Mulberry handles the 401 authentication failure response and gets
credentials when necessary, but this doesn't work right with some
WEBDAV servers.  As a work around get credentials before the first
transaction.

Sources_Common/Preferences_Store/Clients/CWebDAVPrefsClient.cpp

@@ -164,6 +164,20 @@ void CWebDAVPrefsClient::Reset()
 
 void CWebDAVPrefsClient::Logon()
 {
+    // Get authorization info, some servers require it before the first request
+    if (!HasAuthorization() &&
+        GetAccount()->GetAuthenticatorType() != CAuthenticator::eNone)
+    {
+        cdstrvect hdrs;
+        SetHost(mServerAddr);
+        OpenConnection();
+        mAuthorization = GetAuthorization(true, hdrs);
+        if (mAuthorization == (CHTTPAuthorization*) -1)
+        {
+            mAuthorization = NULL;
+        }
+    }
+
 	// Do initialisation if not already done
 	if (!Initialise(mServerAddr, mBaseRURL))
 	{