Error in findInterval(x$log_discharge, break_pts) : 'vec' must be sorted non-decreasingly and not contain NAs

Hi there ... I think I am getting the same issue as this one that was has been closed: https://github.com/USGS-R/EflowStats/issues/155

I added a comment there yesterday but then thought it might be best to submit as a new issue.

I get the following error message when running calc_timingAverage() with some datafiles but not with others:

Error in findInterval(x$log_discharge, break_pts) : 'vec' must be sorted non-decreasingly and not contain NAs

I've attached a few test files that cause this error. These all have many discharge values < 1, so perhaps it is the same problem from the issue that was closed?

[test2.txt](https://github.com/USGS-R/EflowStats/files/2586416/test2.txt)
[test1.txt](https://github.com/USGS-R/EflowStats/files/2586417/test1.txt)
[test3.txt](https://github.com/USGS-R/EflowStats/files/2586418/test3.txt)