Make prettier urls if query is empty dict

[xen]

What do these changes do?

Make better urls for named routes when query is empty dict.

Are there changes in behavior for the user?

Should not require to update or change existed code.

Checklist

• I think the code is well written
• Unit tests for the changes exist

[codecov-io]

Current coverage is 98.28% (diff: 100%)

Merging #1143 into master will not change coverage

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  Lines          6489       6489          
  Methods           0          0          
  Messages          0          0          
  Branches       1087       1087          
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  Hits           6378       6378          
  Misses           61         61          
  Partials         50         50          

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[asvetlov]

Thanks!

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