initialize QString with empty string instead of 0 (Qt 4.7 doesn't lik…

…e it)

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@13213 c8812cc2-4d05-0410-92ff-de0c093fc19c

src/core/qgshttptransaction.cpp

@@ -48,7 +48,7 @@ QgsHttpTransaction::QgsHttpTransaction( QString uri,
     : httpresponsecontenttype( 0 ),
     httpurl( uri ),
     httphost( proxyHost ),
-    mError( 0 )
+    mError( "" )
 {
   QSettings s;
   mNetworkTimeoutMsec = s.value( "/qgis/networkAndProxy/networkTimeout", "20000" ).toInt();