Window.nonBlockingForm active status was not being tested correctly. Was causing unexpected fail on second attempt to show form

interface/src/scripting/WindowScriptingInterface.cpp

@@ -200,7 +200,7 @@ void WindowScriptingInterface::showNonBlockingForm(const QString& title, QScript
     }
     
     // what should we do if someone calls us while we still think we have a dialog showing???
-    if (_editDialog) {
+    if (_nonBlockingFormActive) {
         qDebug() << "Show Non-Blocking Form called when form already active.";
         return;
     }