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applets/weather: don't use empty string as source

Christoph Wolk requested to merge cwo/kdeplasma-addons:weather_no_empty_ion into master

When no location has been set yet, the default value for the weatherSource is an empty string. This is passed to the dataengine, which complains about not finding an ion with that name. There does not seem to be a way to get it to not use a value as the data source except not setting one.

So we set the data source using a conditional binding that is only set when the weatherSource is not the the empty string, and silence the warning.

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