rm: cannot remove './nunchaku/tmp*.*': No such file or directory

[johnyf]

tlapm attempts to remove a non-existent directory related to nunchaku, and prints the output

https://github.com/tlaplus/v2-tlapm/blob/eb830974341821885b1e0c14e81c675543135360/src/tlapm.ml#L154-L157

Although an error is not raised, the output on the command line suggests that there was an error. Printing a message with more information may be helpful to the user.