Fix Error for "when will it snow" query if no precipitation is forecasted

[forslund]

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Description

This will not perform translation of percentage when the result doesn't contain percentage to translate.

Type of PR

If your PR fits more than one category, there is a high chance you should submit more than one PR. Please consider this carefully before opening the PR. Either delete those that do not apply, or add an x between the square brackets like so: - [x]

• [x] Bugfix
• [ ] Feature implementation
• [ ] Refactor of code (without functional changes)
• [ ] Documentation improvements
• [ ] Test improvements

Testing

Try asking "when will it snow" in a location that has no precipitation forecasted and make sure no error occurs. And make sure that a location that has forecasted precipitation will still report correctly.