fix(core): df.sort and df.take had a bug, that sometimes cancelled.
fix(core): df.sort and df.take had a bug, that sometimes cancelled.

Introduced in 65e634c318a23d655dd28125386c4fe75b9df1c6

maartenbreddels/vaex,maartenbreddels/vaex,maartenbreddels/vaex,maartenbreddels/vaex,maartenbreddels/vaex,maartenbreddels/vaex