Somebody on the team was having trouble tracing streams due to breaks in the streams introduced when converting raster to feature.
So here is slick little solution which takes n paths in a line features and makes a 1 path (aka 1 part) out of it.
None of the vertices are moved. Where there were two paths separated by a gap you will have one path with no gap.
To work property the paths have to be pointed in the same direction and not be converging. To deal with that would require quite a bit more logic.
As is script modified data in place, so back up your data before using.