ER: give concat a better error message for incompatible types
Merge pull request #5011 from cpcloud/concat-err-msg

ER: give concat a better error message for incompatible types
ENH: new script to find raised exceptions that lack an error message

parse asserts script initial commit

Signed-off-by: Phillip Cloud <cpcloud@gmail.com>

CLN: start adding messages to empty assertions

Signed-off-by: Phillip Cloud <cpcloud@gmail.com>

ENH: new script to find raised exceptions that lack an error message

You can also look at the current error messages for every raised exception

ENH: add validation for format spec strings