"RangeError: invalid digits value: NaN." when loading a profile

Some of my profiles generated by taskcluster fail to load. Example url:
https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2FIZgEQVU3RxueVnEANqiX_A%2Fruns%2F0%2Fartifacts%2Fpublic%2Fbuild%2Fprofile_build_resources.json

The error console shows:
```
Uncaught RangeError: invalid digits value: NaN
_getNumberFormat format-numbers.js:30
memoized Immutable
formatNumber format-numbers.js:80
formatNanoseconds format-numbers.js:218
formatTimestamp format-numbers.js:345
getFormattedTimeLength committed-ranges.js:169
render ProfileFilterNavigator.js:77
React 14
Redux 7
urlSetupDone app.js:89
Redux 2
setupInitialUrlState app.js:173
withHistoryReplaceStateSync url-handling.js:89
setupInitialUrlState app.js:170
Redux 2
_processInitialUrls UrlManager.js:138
format-numbers.js:30:9
```

Adding a console.log call in ProfileFilterNavigator.js before the getFormattedTimeLength call shows the range object is: Object { start: 0, end: NaN }

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-32)