[openstreetmap-website] Pressing "go" on search repeatedly (with nothing in search box) pans map (#793)

[Rezonansowy]

I confirm. We can mark this as **easy**, just implement the *don't do anything when the searchbox is empty* rule.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/793#issuecomment-58765449
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