Fix "undefined" in weather modules header. #2103
Merged
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The original PR for this issue (#2083) doesnt really fix it for current browsers or electron.
The issue comes from the data.header being undefined but later filled with values as is the case in the weather modules where the API later fills the header with the name of the location.
This PR fixes #1985 in my opinion for good. It cleans up the header text generation in the weather modules as well as in the module class. It also adds some tests for displaying the header.