bug #86316: a smoketest blocker. my fix for bug #85271 caused a regression because I accidentally put empty strings in a place where |NULL|s were needed.

netwerk/protocol/http/src/nsHttpConnection.h

@@ -152,9 +152,12 @@ public:
 
         NS_INIT_ISUPPORTS();
 
-        mHost.Adopt(nsCRT::strdup(host));
-        mProxyHost.Adopt(nsCRT::strdup(proxyHost));
-        mProxyType.Adopt(nsCRT::strdup(proxyType));
+        if (host)
+          mHost.Adopt(nsCRT::strdup(host));
+        if (proxyHost)
+          mProxyHost.Adopt(nsCRT::strdup(proxyHost));
+        if (proxyType)
+          mProxyType.Adopt(nsCRT::strdup(proxyType));
 
         mPort = port == -1 ? DefaultPort() : port;
     }