IndexError: single positional indexer is out-of-bounds

[SafwanElmadani]

strym version: 0.3.6
I'm getting this error when using strymread.ts_sync() to resample two time series data.

[rahulbhadani]

There were a couple of bugs and issues encountered while tracking down this problem:

• The portion of code that removes duplicated indices had a bug
• When concatenating multiple data frames from all 16 traces of radar, then the final data frame must be sorted by Time
• When specifying two data frames to ts_sync there must at least be an overlap of two timeseries data frames in time,