remove method completion hints if parameter count was changed 'manually'

python/testSrc/com/jetbrains/python/PyParameterInfoTest.java

@@ -660,6 +660,11 @@ public class PyParameterInfoTest extends LightMarkedTestCase {
       // nothing, we don't use it
     }
 
+    @Override
+    public Object getHighlightedParameter() {
+      return null;
+    }
+
     @Override
     public void setCurrentParameter(int index) {
       myIndex = index;