Use the default value supplied to prompt() if no stored value was found. (bug 216324)

toolkit/components/passwordmgr/base/nsSingleSignonPrompt.cpp

@@ -79,9 +79,13 @@ nsSingleSignonPrompt::Prompt(const PRUnichar* aDialogTitle,
                                    outUser,
                                    outPassword);
 
-    value = ToNewUnicode(outUser);
+    if (!outUser.IsEmpty())
+      value = ToNewUnicode(outUser);
   }
 
+  if (!value && aDefaultText)
+    value = ToNewUnicode(nsDependentString(aDefaultText));
+
   mPrompt->Prompt(aDialogTitle,
                   aText,
                   &value,