Don't load the maps in edit mode

This prevents the macro from being inserted with the WYSIWYG editor on Firefox.

STEPS TO REPRODUCE
On a fresh instance of XWiki 6.4 and choose WYSIWYG as default editor from Preferences.

1. Login with Admin credentials
2. Go to Administer Wiki -> Add Extensions and search for "Map Macro" and install it.
3. Create new page
4. Click on MACRO button from WYSIWYG horizontal menu -> Insert Macro and search for "MAP".
5. One result will be displayed. Click on it and then press "Select"
6. Write a city & country in this format "Paris, France" on LOCATION field and then press "Insert Macro"
7. A spinner is displayed and it's loading endless.
8. Press Save & View and then a error is displayed on the bottom of the page "Error content: Exception while parsing HTML"

This issue is reproducing only on FIREFOX 37.
On Chrome & Internet Explorer it work fine.