Unexpected failures if runpath string is not properly formatted

[larsevj]

What happened? (You can include a screenshot if it helps explain)

A user had forgotten to include the <> around the ITER and IENS in the runpath format string. This resulted in the gui showing all realizations finished successfully however only the last realization showed progress for each forward model step. Reason being that all realizations ran in the same runpath folder. Ert logged a warning due to no substitution string, but this is difficult for a user to notice.

What did you expect to happen?

Should give a better warning if there is no and , or %d?

steps to reproduce

Environment where bug has been observed

• python 3.10
• python 3.11
• python 3.12
• macosx
• rhel7
• rhel8
• local queue
• lsf queue
• slurm queue
• openPBS queue