Bug 1275746 - nsNavHistory::AsciiHostNameFromHostString return empty string if host is empty r=mak

MozReview-Commit-ID: 3AKgNCXPKoU

toolkit/components/places/nsNavHistory.cpp

@@ -952,6 +952,10 @@ nsresult // static
 nsNavHistory::AsciiHostNameFromHostString(const nsACString& aHostName,
                                           nsACString& aAscii)
 {
+  aAscii.Truncate();
+  if (aHostName.IsEmpty()) {
+    return NS_OK;
+  }
   // To properly generate a uri we must provide a protocol.
   nsAutoCString fakeURL("http://");
   fakeURL.Append(aHostName);