Exporting NDVI Data with Google Earth Engine not working as expected

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I am an Editor for a German newspaper with just rudimentary scripting skills. This code makes it possible to analyze NDVI data for 50 cities in Germany to calculate the green amount for each citiy.

With

var germany = ee.FeatureCollection('ft:1KDrYXBDlAx1fhcfmWRx7u_qqN2O_gwBNInjnGmnZ');
var cities = ee.FeatureCollection('ft:1w4PgU3okfzwKFEIpH32oPMlOtei6hUWa9tkXv5Rt');

the script loads a google fusion table with a germany shape and a table with geometries for the cities. Everything works fine so far. But if I change fusion tables to

var germany = ee.FeatureCollection('ft:1M7PhnbkAGZuKp4hnanZQlaoNOSDnnOSQdeIPUZwS'); 
var cities = ee.FeatureCollection('ft:1K9Km7OyeCyJZMWhZOob_OiHJZbcO2uTWoNS9p1-h');

to use different geometries, it is not working anymore. Neither it is showing the geometries in GEE nor the exported NDVI Green Amount data is correct (it shows just 0 für every polygon).

Any clues what I could do to fix this?

Thanks, Chris

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