Calling reloadMap fails when commercial layers are enabled

[loureiro]

We call reloadMap() in order to update the legends panel after a layer is dynamically added/remove. This fails when Google Maps in enabled in the background.

Steps to reproduce:

• Open Sheboygan SlateCommecial flexible layout.
• Issue the call Fusion.getWidgetById('Map').reloadMap() in the browser console.
• Verify that map panning stops working (freezes) and the Fusion error below is displayed.
• You may recover from the error with a refresh operation.

Error Details: Uncaught TypeError: Cannot read property 'y' of null

Stack Trace:

• ? at ​http://localhost:8008/mapguide/fusion/lib/fusionSF-compressed.js (line: 1303)

Source: ​http://localhost:8008/mapguide/fusion/templates/mapguide/slate/index.html?ApplicationDefinition=Library://Samples/Sheboygan/FlexibleLayouts/SlateCommercial.ApplicationDefinition&locale=en

[jng]

Moved to here: ​http://trac.osgeo.org/fusion/ticket/630