Fixed a crash at startup on the Mac (a null-check on 'mProxySvc').

netwerk/protocol/http/src/nsHTTPHandler.cpp

@@ -272,12 +272,14 @@ nsHTTPHandler::NewChannel(nsIURI* i_URL, nsIChannel **o_Instance)
             rv = pChannel->Init();
             if (NS_FAILED(rv)) goto done;
 
+						if (mProxySvc) {
 	            rv = mProxySvc->GetProxyEnabled(&checkForProxy);
 	            if (checkForProxy)
 	            {
 	                rv = mProxySvc->ExamineForProxy(i_URL, pChannel);
 	                if (NS_FAILED(rv)) goto done;
 	            }
+            }
 
             rv = pChannel->QueryInterface(NS_GET_IID(nsIChannel), 
                                           (void**)o_Instance);
@@ -765,6 +767,8 @@ nsHTTPHandler::Init()
     nsresult rv = NS_OK;
 
     mProxySvc = do_GetService(kProtocolProxyServiceCID, &rv);
+    NS_ASSERTION (NS_SUCCEEDED(rv), "Get Proxy Service failed");
+
     mPrefs = do_GetService(kPrefServiceCID, &rv);
     if (!mPrefs)
         return NS_ERROR_OUT_OF_MEMORY;