Files
Scoop/libexec
Sergey 43e0c20468 Print '0 B' when cache is empty (#1109)
If cache is empty `$total_length` is null, and the output is:
```
λ scoop cache show some-non-existing-app
total: 0 files,  B
```

Cast sum to double to get '0 B' instead
2016-11-08 10:45:30 +11:00
..
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