Update analyze's error message to provide better clarity

[linsword13]

Example session:

$ ramble workspace analyze --where '{experiment_index} == 1'
==> Streaming details to log:
==>   /usr/local/google/home/linsword/hpc-dev/ramble/var/ramble/workspaces/hostname-test/logs/analyze.2024-09-11_13.12.38.out
==>   Analyzing 1 out of 12 experiments:
==> Error: No analyzeable experiment detected. All selected ones are either templates or the base of repeated experiments.

$ ramble workspace analyze --where '{experiment_index} == 13'
==> Streaming details to log:
==>   /usr/local/google/home/linsword/hpc-dev/ramble/var/ramble/workspaces/hostname-test/logs/analyze.2024-09-11_13.12.44.out
==>   Analyzing 0 out of 12 experiments:
==> Error: No experiment left for analysis after filtering.

[douglasjacobsen]

One small change, otherwise looks good!